Boj Pedro

Boj Pedro
University of Alicante | UA · Optics, Pharmacology and Anatomy

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95
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Publications

Publications (95)
Article
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Organic luminescent radicals, unlike traditional closed‐shell fluorescent emitters, exhibit distinct luminescence mechanisms, offering promising potential for optoelectronic devices. To date, stable luminescent radicals have predominantly been confined to polychlorinated triphenylmethyl radicals, underscoring the need for new platforms to expand th...
Article
Organic luminescent radicals, unlike traditional closed‐shell fluorescent emitters, exhibit distinct luminescence mechanisms, offering promising potential for optoelectronic devices. To date, stable luminescent radicals have predominantly been confined to polychlorinated triphenylmethyl radicals, underscoring the need for new platforms to expand th...
Article
Full-text available
Graphene‐like molecules with multiple zigzag edges are emerging as promising gain materials for organic lasers. Their emission wavelengths can vary widely, ranging from visible to near‐infrared (NIR), as the molecular size increases. Specifically, rhombus‐shaped molecular graphenes with two pairs of parallel zigzag edges, known as [n]rhombenes, are...
Article
Full-text available
Surface‐emitting organic distributed feedback (DFB) lasers are attractive devices for label‐free sensing applications. Of particular interest for cost‐reduction purposes are devices in which both active material and resonator are based on solution‐processable polymeric materials. Here, the capability for label‐free refractive index sensing of DFB d...
Article
Graphene‐like molecules with multiple zigzag edges are emerging as promising gain materials for organic lasers. Their emission wavelengths can vary widely, ranging from visible to near‐infrared (NIR), as molecular size increases. Specifically, rhombus‐shaped molecular graphenes with two pairs of parallel zigzag edges, known as [n]rhombenes, are exc...
Article
Full-text available
Polycyclic Aromatic Hydrocarbons (PAHs) have demonstrated potential as active laser materials, showing good Amplified Stimulated Emission (ASE) properties. However, the molecular origin of their ASE properties is still unclear and...
Article
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A method to fabricate gold nanoparticles in gelatin films and pattern them into gratings with periods down to 200 nm is reported. The procedure, based on holographic lithography, dry etching...
Article
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Perylenediimide (PDI) compounds are widely used as the active units of thin-film organic lasers. Lately, PDIs bearing two sterically hindering diphenylphenoxy groups at the 1,7-bay positions have received attention because they provide a way to red-shift the emission with respect to bay-unsubstituted PDIs, while maintaining a good amplified spontan...
Article
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Large graphene‐like molecules with four zigzag edges are ideal gain medium materials for organic near‐infrared (NIR) lasers. However, synthesizing them becomes increasingly challenging as the molecular size increases. In this study, we introduce a new intramolecular radical‐radical coupling approach and successfully synthesize two fused triangulene...
Article
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We report the synthesis of a dibenzodinaphthocoronene (DBDNC) derivative as a novel nanographene with armchair, zigzag, and fjord edges, which was characterized by NMR and X-ray crystallography as well as infrared (IR) and Raman spectroscopies. Ultrafast transient absorption (TA) spectroscopy revealed the presence of stimulated emission signals at...
Article
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Donor-Acceptor (D-A) naphthalimides (NI) are highly fluorescent multitask compounds that have demonstrated success in a variety of optoelectronic applications, among which, thin film organic lasers (TFOLs) are not included. Here...
Article
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Zigzag edged nanographenes such as peri‐acenoacenes are promising materials for organic lasers, but the effects of heteroatom doping on the electronic properties and gain medium performance remain unclear. Herein, the facile synthesis of a new 1,2‐oxaborine (BO) doped peri‐tetracenotetracene derivative, the bis(1,2‐oxaborine)peri‐tetracenotetracene...
Article
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The molecule N,N′-bis(3-methylphenyl)-N,N′-dyphenylbenzidine (TPD) has been widely used in optoelectronic applications, mainly for its hole-transporting properties, but also for its capability to emit blue light and amplified spontaneous emission, which is important for the development of organic lasers. Here, we report deep-blue-emitting distribut...
Article
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The spectral overlap between stimulated emission (SE) and absorption from dark states (i.e. charges and triplets) especially in the near-infrared (NIR), represents one of the most effective gain loss channels in organic semiconductors. Recently, bottom-up synthesis of atomically precise graphene nanostructures, or nanographenes (NGs), has opened a...
Article
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High-transparency polymers, called optical polymers (OPs), are used in many thin-film devices, for which the knowledge of film thickness (h) and refractive index (n) is generally required. Spectrophotometry is a cost-effective, simple and fast non-destructive method often used to determine these parameters simultaneously, but its application is lim...
Article
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The search of compounds emitting in the near‐infrared (NIR) has been accelerated owing to their use in biomedical and telecommunications applications. In this regard, nanographenes (NGs) are attractive materials adequate for integration with other technologies, which have recently demonstrated amplified spontaneous emission (ASE) and lasing across...
Article
A naphtho[2,1-b:6,5-b']difuran derivative was found to serve as an effective violet-emitting laser dye. It showed amplified spontaneous emission at 413 nm with the threshold of 1.1-2.9 mJ cm-2 using 0.1-0.5...
Article
The increasing number of solution-processed laser compounds that can be implemented as low-cost, flexible, and/or integrated devices, makes necessary the development of reliable methods to delineate all their amplifying signatures and thus to open the door to appropriate cross-sample comparisons. Seeking to solve this problem, a new formalism to re...
Article
Full-text available
All‐solution processed surface‐emitting organic distributed feedback lasers are attractive devices for low‐cost applications. Here, lasers emitting in the spectral region between 375 and 475 nm, in which both active material and resonator (1D relief gratings) are based on solution‐processable polymer films, are reported. Ten different organic compo...
Article
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ANTECEDENTES/OBJETIVOS: Analizar la bibliografía sobre los telescopios implantables, como ayudas ópticas para baja visión. Los objetivos específicos son: 1.Identificar los diferentes tipos de telescopios implantables; 2.Determinar cómo estos afectan a la función visual; 3.Estudiar la distribución temporal; 4.Analizar los países e instituciones; 5.A...
Article
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ANTECEDENTES/OBJETIVOS: Analizar la bibliografía científica que estudia los programas de entrenamiento y rehabilitación visual (RV) en pacientes con baja visión (BV). Los objetivos específicos son: 1.Analizar la distribución temporal y geográfica, 2.Identificar las revistas e instituciones, 3.Analizar la autoría según el género, 4.Identificar la pa...
Article
Full-text available
Chemically synthesized zigzag-edged nanographenes (NG) have recently demonstrated great success as the active laser units in solution-processed organic distributed feedback (DFB) lasers. Here, we report the first observation of dual amplified spontaneous emission (ASE) from a large-size NG derivative (with 12 benzenoid rings) dispersed in a polysty...
Article
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Perylene‐fused, aggregation‐free polycyclic aromatic hydrocarbons with partial zigzag periphery (ZY‐01, ZY‐02, and ZY‐03) were synthesized. X‐ray crystallographic analysis reveals that there is no intermolecular π–π stacking in any of the three molecules, and as a result, they show moderate‐to‐high photoluminescence quantum yield in both solution a...
Article
Novel organic lasers were fashioned from large, aggregation‐free polycyclic aromatic hydrocarbons (PAHs. Several new perylene‐based PAHs were prepared that show perylene‐like electronic properties with moderate fluorescence quantum yields. Two of them show amplified spontaneous emission, and solution‐processed distributed feedback lasers were succe...
Article
Full-text available
Carbon-bridged oligo(p-phenylenevinylene)s (COPVn with repeating unit n = 16) have demonstrated great success as laser dyes for thin-film organic lasers. The excellent photostability observed in the longer homologues is, however, not present in the blue-emitting shorter compounds COPV1 and COPV2, attributed to the unprotected terminal positions tha...
Article
The design and fabrication of thin-film based organic optoelectronic devices require knowledge of the film optical properties. A low-cost and non-destructive method often used for optical characterization of films is the well-established spectrophotometric envelope method. However, this method is typically limited to thickness above 400 nm, a value...
Article
The design, synthesis and evaluation of the amplified spontaneous emission (ASE) properties of a series of arylalkynyl-benzo[c][1,2,5]thiadiazole (BTD) and [1,2,5]thiadiazolo[3,4-g]quinoxaline (TDQ) derivatives are described. The synthetic strategy entailed the use of Sonogashira and Stille reactions based on the different aromatic natures of the t...
Article
Full-text available
Surface-emitting distributed feedback (DFB) lasers with both, resonator and active material based on solution-processable polymers, are attractive light sources for a variety of low-cost applications. Besides, the lasers should have competitive characteristics compared to devices based on high-quality inorganic resonators. Here, we report high perf...
Article
Full-text available
The chemical synthesis of nanographene molecules constitutes the bottom-up approach toward graphene, simultaneously providing rational chemical design, structure-property control and exploitation of their semiconducting and luminescence properties. Here, we report nanographene-based lasers from three zigzag-edged polycyclic aromatics. The devices c...
Article
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Perylenediimide (PDI) dyes dispersed in polymer films have demonstrated great success as active materials in thin film organic lasers (TFOLs). The type of matrix used to host the dye and the dye doping rate are both crucial parameters to optimize laser performance. This work reports the study of two soluble PDIs, the comercial derivative perylene o...
Article
Full-text available
La Sensibilidad al Contrate (SC) determina la capacidad del sistema visual para discriminar la forma de los objetos y depende fundamentalmente de la frencuencia y luminancia de los mismos. Las variaciones de la SC con la frecuencia del objeto representa la unción de Sensibilidad al Contraste (CSF) de un observador. Las alteraciones en la forma de l...
Article
Thin‐film organic lasers are attractive light sources for a variety of applications. Recently, it is reported that carbon‐bridged oligo(p‐phenylenevinylene)s (COPVn with repeating unit n = 1–6) function as unique laser dyes which combine high fluorescence efficiency, wavelength tunability, and both thermal and photostability, making them ideal for...
Conference Paper
Latest advances from our research group towards improving the performance of solution-processed distributed feedback lasers will be discussed. They include advances on the laser material and the resonator and their application as optical sensors.
Article
Full-text available
Determinar las aplicaciones de los diferentes filtros de absorción en Baja Visión (BV) y explorar la investigación publicada sobre este tema. Desarrollamos un estudio bibliométrico y una revisión sistemática. Consultamos 6 bases de datos: EMBASE, Medline, WOS, VHL, SCOPUS y Science Direct. Se incluyeron artículos que estudian filtros en pacientes d...
Article
Thin film organic lasers represent attractive light sources for numerous applications. Currently, efforts are devoted to the development of low-cost high-performance and color-tunable devices, whereby both the resonator and the active layer should consist of solution-processable organic materials. Herein, solution-processed distributed-feedback las...
Article
Full-text available
Two-dimensional (2D) distributed feedback (DFB) lasers with gratings imprinted by thermal nanoimprint lithography on the active film are reported. They show thresholds for lasing of ∼10 kW/cm², similar to the most efficient imprinted DFB lasers reported; and long operational lifetimes (under ambient conditions) of ∼12 × 10⁴ pump pulses. The key for...
Article
Carbon-bridged bis(aminoaryl) oligo(para-phenylenevinylene)s have been prepared and their optical, electrochemical, and structural properties analyzed. Their radical cations are class III and class II mixed-valence systems, depending on the molecular size, and they show electronic couplings which are among the largest for the self-exchange reaction...
Article
Carbon-bridged bis(aminoaryl) oligo(para-phenylenevinylene)s have been prepared and their optical, electrochemical, and structural properties analyzed. Their radical cations are class III and class II mixed-valence systems, depending on the molecular size, and they show electronic couplings which are among the largest for the self-exchange reaction...
Patent
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Oligo(p-fenilenvinilenos) con puente de carbono como colorantes láser para láseres orgánicos de estado sólido. La presente solicitud de patente se refiere a un dispositivo de láser que comprende oligo(pfenilenvinileno) con puentes de carbono (COPV) como compuesto orgánico con actividad láser. La presente solicitud de patente se refiere también a un...
Article
Solution-processed polymer films are used in multiple technological applications. The presence of residual solvent in the film, as a consequence of the preparation method, affects the material properties, so films are typically subjected to post-deposition thermal annealing treatments aiming at its elimination. Monitoring the amount of solvent elim...
Chapter
This manuscript originates from the different contributions presented in the Scientific Meeting of the Materials Institute throughout its first 10 years of existence. The Materials Institute “Instituto Universitario de Materiales de Alicante” (IUMA) organizes a scientific meeting each year (Scientific Meeting of the IUMA) with the objective of gath...
Research
Full-text available
Thin film organic solid-state lasers (OSLs)1,2 represent a new generation of inexpensive, mechanically flexible devices for spectroscopy3,4, optical communications5 and sensing6,7 requiring an organic, efficient, stable, wavelength-tunable and solution-processible laser material. At the moment, such REV-11a material combining all these properties a...
Article
Full-text available
Thin film organic lasers represent a new generation of inexpensive, mechanically flexible devices for spectroscopy, optical communications and sensing. For this purpose, it is desired to develop highly efficient, stable, wavelength-tunable and solution-processable organic laser materials. Here we report that carbon-bridged oligo(p-phenylenevinylene...
Conference Paper
Thin film organic lasers (TFOLs) represent a new generation of inexpensive, mechanically flexible devices with demonstrated applicability in numerous applications in the fields of spectroscopy, optical communications and sensing requiring an organic, efficient, stable, wavelength-tunable and solution-processable laser material. A distributed feedba...
Article
The human epidermal growth factor receptor 2 (ErbB2) protein plays an important role in human malignancies. Its overexpression has been recognized as a feature of a malignant cancerous phenotype in breast cancer cell lines, and has become one of the most widely investigated clinical indicators of breast, ovarian, gastrointestinal and lung cancers....
Conference Paper
Distributed feedback (DFB) laser sensors with active films consisting of a highly efficient and photostable perylenediimide dye (perylene orange, PDI-O) dispersed in polysytrene (PS), used as passive matrix, are reported. PDIdoped- PS DFB lasers show an excellent operational durability under ambient conditions, superior to those of previously repor...
Article
Amplified spontaneous emission (ASE) in dye-doped mesostructured silica films, deposited directly over fused silica substrates, is demonstrated with low thresholds. Due to functionalization of the silica network with phenyl groups, the refractive index of the active layer is sufficiently increased to impart waveguiding properties that lead to highl...
Article
The refractive index sensing capabilitity of distributed feedback (DFB) lasers based on highly photostable (under ambient conditions) perylenediimide-based active films, are reported. The sensor bulk sensitivity is determined from changes in the laser emission wavelength upon exposure to different liquids. The role of the active film thickness (hf)...
Article
Full-text available
A simple, low-cost and versatile holographic method to produce reusable surface-relief gratings on dichromated poly(vinyl alcohol) (DCPVA) films, with periods Λ ≥ 270 nm and modulation depths up to 300 nm, is reported. DCPVA presents processing advantages with respect to other photoresists, such as dichromated gelatine, i.e. higher light sensitivit...
Article
Abstract In the present work thermal-nanoimprint lithography of various commercial thermoplastic resists as matrixes for perylenediimides (PDIs) has been studied. This fabrication method reduces the number of fabrication steps, and therefore, the cost of the obtained distributed feedback (DFB) lasers. The optical properties of these devices are ana...
Article
Amplified spontaneous emission (ASE) is observed, under optical pump, in polystyrene films doped with two pentathienoacene derivatives functionalised with thienyl-S,S-dioxide groups (compounds 2 and 3). The effect of the dioxide groups on the ASE properties is analysed by comparing the performance with that of its corresponding non-oxidized analogu...
Article
One dimensional second-order distributed feedback (DFB) lasers consisting of polystyrene (PS) films doped with a perylenediimide laser dye, deposited over dichromated gelatine (DCG) photoresist layers with solvent resistant relief gratings recorded by holographic lithography, are reported. The advantage of using the grating on DCG in the final devi...
Article
Full-text available
The aim of this work was to improve the laser performance, in terms of threshold and operational lifetime, of lasers based on polymer films doped with perylenediimide (PDI) derivatives as active media. For such purpose, we first investigated the amplified spontaneous emission (ASE) properties of perylene orange (PDI-O), when doped into polystyrene...
Article
Three-in-one: A novel distyrylbenzene-based material forms J-type aggregates in single crystals with highly polarized and bright red emission, giving rise to optical gain narrowing, for which different mechanisms (amplified spontaneous emission, laser emission and stimulated resonance Raman scattering) are observed. These are correlated with the fa...
Article
Full-text available
It is shown that the optical pump power (or energy) density thresholds required to obtain lasing from organic second-order distributed feedback lasers, increase when the excitation area (A) is smaller than a certain value (A(crit)). So, in order to obtain the minimum possible thresholds and to ensure that they constitute adequate quantities for com...
Article
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We report on the preparation and characterization, under optical pump, of second-order one-dimensional distributed feedback (DFB) lasers based on polystyrene films doped with a perylenediimide derivative, as active media. The DFB gratings were engraved on the substrates (SiO2) by thermal nanoimprint lithography, followed by reactive ion etching. La...
Article
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The effect of varying film thickness ( h ) on the amplified spontaneous emission (ASE) properties of 0.5 wt . % perylenediimide-doped polystyrene waveguides is reported. The threshold dependence on h , not previously investigated in detail, is analyzed in terms of the film absorption and photoluminescence, the confinement of the fundamental wavegui...
Article
Full-text available
We report on the fabrication of efficient organic distributed feedback (DFB) lasers with thermally-nanoimprinted active films, emitting between 565 and 580 nm. The use of thermal-NIL has allowed, as opposed to room temperature or solvent-assisted techniques, high grating quality and excellent modulation depth. The 155°C heat exposure of the NIL pro...
Article
Full-text available
An efficient, low-cost, and highly photostable second-order distributed feedback (DFB) laser, fabricated by thermal nanoimprint lithography and based on a polymer active film containing a perylenediimide derivative, is reported. It shows a photostability half-life of 3.1×105 pump pulses (>8h), when pumped at the same spot of the film. This value is...
Article
Full-text available
This paper aims to review the recent advances achieved in the field of organic solid-state lasers with respect to the usage of semiconducting organic molecules and oligomers in the form of thin films as active laser media. We mainly focus on the work performed in the last few years by our research group. The amplified spontaneous emission (ASE) pro...
Article
A highly photostable distributed feedback (DFB) laser has been fabricated by spin-coating a polystyrene film doped with a perylenediimide derivative on a SiO2 grating. The second-order grating, with a period of 368 nm, was fabricated via thermal nanoimprint lithography and pattern transfer. When the DFB laser is photopumped at 533 nm, the laser emi...
Conference Paper
Full-text available
The fabrication and characterization of highly efficient and photostable second-order distributed feedback lasers (DFB), based on polystyrene films doped with a perylenediimide (PDI) derivative as active laser material, is reported. DFB gratings were obtained via thermal nanoimprint lithography and transferred to SiO(2) substrates by reactive ion e...
Article
Full-text available
Nanoimprint lithography (NIL) is a promising technique for the fabrication of surface pattern features down to 20 nm, even for future industrial applications, because of its high throughput, low cost and high fidelity pattern transfer. We have used this technique to make distributed feedback (DFB) resonant cavities for solid-state lasers based on s...
Article
Full-text available
Single-mode second-order distributed feedback (DFB) lasers with low threshold, based on polystyrene films doped with 30 wt . % of the hole-transporting organic molecule N, N ′ -bis (3-methylphenyl)-N, N ′ - diphenylbenzidine (TPD) are reported. The laser emission wavelength was tuned between 415 and 427 nm by film thickness variation. The effective...
Article
In this work we study the effect of different types of modifications of the chemical structure of perylenebisimide derivatives (PBIs) in the laser properties of PBI-doped polystyrene films at various concentrations. In particular, we focus on controlling the wavelength of emission, in order to tune the laser wavelength, as well as on increasing the...