Xiaobing Luo

• PhD
• Professor (Full) at Huazhong University of Science and Technology

The rapid and accurate prediction of temperature fields in complex structures remains a significant challenge in thermal engineering. Experimental approaches often struggle to provide comprehensive data, while traditional full-order numerical methods are hindered by their excessive computational demands. This study addresses these limitations by de...

Thermal field prediction has garnered ever-increasing attentions as an urgent and vital issue in broad applications ranging from thermal management, performance prognosis, lifetime evaluation, safety assessment, to energy conversion and carbon neutrality. Suffering from the huge amounts of data and iterative iterations, traditional full-order predi...

Highlights 3D printing-assisted streamline orientation method was proposed to fabricate composite thermal materials. Mechanism of fluid-based filler orientation control along streamlines was revealed. Thermal conductivity of 3D mesh-shape PDMS/LM composite was 4.8 times higher than that of random PDMS/LM composite. 3D-PSO method exhibits programmab...

Graph neural networks (GNNs) have evolved many variants for predicting the properties of crystal materials. While most networks within this family focus on improving model structures, the significance of atomistic features has not received adequate attention. In this study, we constructed an atomistic line GNN model using compositionally restricted...

The operational stability of radial journal bearings is the bottleneck that limits the reliability of hydraulic suspension micro-pump. Due to self-excited vibrations, the whirl amplitude of the plain journal bearing (PJB) is large at high rotational speeds, which will accelerate wear failure. It has been proven that employing herringbone grooved jo...

Wavelength-selective thermal emitters (WS-TEs) have been frequently designed to achieve desired target emissivity spectra, as a typical emissivity engineering, for broad applications such as thermal camouflage, radiative cooling, and gas sensing, etc. However, previous designs require prior knowledge of materials or structures for different applica...

Filler‐reinforced composite materials are widely used in numerous domains such as energy, optoelectronics, chemistry, and so forth, owing to their versatile microstructures, excellent properties, and low fabrication cost. By finely regulating the distribution and orientation of fillers in the base material, composite materials with fantastic therma...

Passivation makes 2D hexagonal structure more stable than the planar variant. Surface fluorinated monolayer of GaN have been found to have ultra-wide band gap and have promising applications in optoelectronic conversion devices. In this work, using theoretical method, we have explored the thermal conductivity as well as the electronic structure of...

Isotope engineering has been shown to be an effective means of regulating thermal conductivity. In this work, we studied the isotope engineering of thermal conductivity in bulk and 2D GaN, and diametrically opposed atom isotope dependence are found. That is, Ga isotope has a large effect (77%) on bulk GaN, while the effect of N isotope on the therm...

The micropump is the heart of microfluidics systems. However, for mechanical micropumps, bearing wear failure has been a major obstacle to performance and reliability. Hydrodynamic suspension, which can make the rotating components levitate in liquid without any mechanical friction, is applied to break this bottleneck. In this paper, a novel kind o...

Two-dimensional (2D) a-plane gallium nitride, a non-layered 2D material, has promising applications in photoelectric nanodevices due to its direct band bandgap. Herein, employing molecular dynamics simulations, we studied the thermal transport properties of a-plane trilayer GaN, and the temperature, together with strain modulation on the thermal co...

Thermal management has become a bottleneck for high-power electronics due to high heat flux. Liquid cooling has been developed as an effective way to dissipate the heat of electronic devices. However, the existing liquid cooling systems are mostly too bulky to be applied in the miniaturized devices with very limited installation space. In this work...

Rapid identification of lattice thermal conductivity of semiconductors from their crystal structure is required in the discovery of functional materials. A promising strategy is using a machine learning method based on a first-principles dataset, which, however, suffers from the dilemma of too little data available. In this work, the crystal graph...

Laser-excited white lighting, which is achieved by laser diodes and phosphor converters, has garnered increasing interest in recent years due to their high-power and high-brightness characteristics. Nevertheless, two long-standing thermal issues remain formidable: first, the photoluminescent phosphors also generate heat due to the Stokes loss, whic...

Filler-reinforced polymer composites are widely applied in thermal management field on account of their promising heat transport ability, superior flexibility and excellent durability. Inside these composites, thermally conductive fillers are usually uniformly distributed or unidirectionally oriented in polymer matrix to improve thermal performance...

Spray cooling is a promising thermal management solution for high heat flux applications. Surface orientation is a key parameter of spray cooling performance while vertical surface orientation has been proved to have excellent heat transfer performance. However, key spray parameters regarding the vertical surface spray cooling system have not been...

Quantum dots (QDs) are facing significant photoluminescence degradation in moisture environment. In QDs-silicone composites, the poor water resistance of silicone matrix makes it easy for water and oxygen molecules to erode QDs. To tackle this issue, we proposed a new QDs protection strategy by introducing short-chain silica precursors onto the QDs...

In layered materials, it is well known that the cross-plane or cross-chain (CC) thermal conductivity is lower than that of the in-plane or along-chain direction due to weaker bonding in the cross-plane or CC directions. In this work, surprisingly, we predict using first-principles that the CC thermal conductivity κ⊥ is higher than the along-chain t...

Tellurene (Te) has attracted tremendous interest due to its outstanding electronic, thermoelectric, and optoelectronic properties. Recently, it is found that 2-layer Te exhibits an abnormal anisotropy of in-plane thermal conductivity. This inspires the current investigation, where the thickness dependence of in-plane thermal conductivities of tellu...

Piezoelectric pump, driven by piezoelectric actuator, is one of the most promising micropumps in compact system. However, the application of piezoelectric pump is limited by the check valve, which is not efficient enough and needs careful fixation. This work presents a novel design with unfixed check valve, which greatly simplifies the assembly of...

Thermal diode, which allows heat transfer between two terminals in one direction but blocks it in the opposite direction, has attracted extensive attention in recent years because of its potential applications in thermal management, energy systems, information processing and so on. Compared to the conductive thermal diode, the photon-based radiativ...

Quantum dot (QD) features many exceptional optical performances but is also vulnerable to moisture which results in structural damage and luminescent decrease. This work provided and fabricated a novel superior hydrophobic methylated core/shell silica-coated QD (MSQ) for high water stability. QD was coated with a silica shell and then surface-methy...

Near-field thermophotonic (TPX) systems that replace the high-temperature emitter in the thermophotovoltaic systems with a light-emitting diode (LED) have been reported to achieve low-grade heat harvesting and electroluminescent cooling, respectively. Nevertheless, the requirements for the two functionalities are different, leading to challenges to...

Radiative cooling, which aims at cooling objects by radiating heat into the outer space through the atmosphere window, has garnered wide interests since it is a passive refrigeration mode without extra energy consumption. However, most of the proposed structures, to maximize the cooling performance, are in white color, which may limit their practic...

Taking heat positively as the information carrier, thermotronics can exempt the long-lasting thermal issue of electronics fundamentally, yet has been faced with the challenging multiplexing integration of diverse functionalities. Here, we demonstrate a spatiotemporal modulation platform to achieve multiplexing thermotronics functionalities based on...

With the increasing development of infrared (IR) detection technologies for both military and civil applications, IR anti‐detection technologies, also known as thermal camouflage technologies, have attracted great attention in recent years. Decreasing the surface emissivity may be effective for high‐temperature targets, but fails for adaptive therm...

Thermocell, as a novel thermoelectric conversion device based on redox reaction or ion diffusion, has exhibited great advantages like high thermopower coefficient, cost effectiveness and good scalability for low-grade heat harvesting. Compared to the liquid-based thermocell, the gel-based version has garnered more and more attention because of its...

Thermal metamaterials have been extensively studied due to their extraordinary properties beyond natural materials and offered great flexibilities to tune heat flow for desired thermal functionalities, like thermal cloaking, concentrating, rotating, etc. Whereas, the thermal properties of thermal metamaterials are usually fixed once the configurati...

Photoluminescent composites play a critical role of light converters in light-emitting devices, especially in high-power light-emitting diodes and laser diodes, while the nonradiative Stokes loss in photoluminescent particles not only generates thermal phonons with temperature rise but also degrades their photonic/electronic properties. Moreover, t...

In this work, QDs/hBNs/silicone annular fins (QDs-AF) are proposed as a new type of packaging structure to establish rapid heat dissipation pathways between QDs and heat sink. The QDs-AF structure was firstly designed based on commercial LEDs modules. Then, the annular fin materials including QDs, thermally conductive hBN platelets (hBNs), and sili...

Efficient thermal dissipation has become a critical factor limiting the development of electronic devices. Thermal interface materials (TIMs) connecting the surfaces of heat source and heat sink, are important to guarantee stable and sufficient heat dissipation from heat source to heat sink. Carbon fibers (CFs) are widely used as the reinforcing fi...

The non-radiative electron transitions of Quantum dots (QDs) in White light-emitting diodes (WLEDs) not only generates thermal phonons with temperature rise but also degrades their photonic properties. These nanoscale heat sources are usually embedded in low-thermal-conductivity polymer matrix, which is difficult for building efficient heat dissipa...

Droplet bouncing on surfaces has long been observed in nature and industry, which is rather intriguing and instructive for related technology development. Recent decades have witnessed significant progress on the mechanism exploring, device development, and application demonstrations. In this review, we focus on the recent progresses that aim at in...

Electrically heating garment (EHG) is an effective protection for human in cold environment. In this study, we analysed the principal agents of heat transfer in EHG, and established a theoretical model including heat conduction, natural convection and radiation. To verify the model, the numerical simulations and experiments were compared, and showe...

Narrowband mid-infrared emitters, quantified by the $Q$ -factor, have garnered a lot of attention due to their emerging applications from chemical and biosensing to efficient thermal utilization. Previous studies reported high $Q$ -factor emitters within several selected wavelengths, still lacking a large database of emitter structures with very hi...

Thermal camouflage technologies, which aim at blending the infrared (IR) signature of targets into the background to counter the IR detection, have witnessed increasing development. To achieve thermal camouflage, the rule of thumb is to balance the thermal radiation between the target and the background, and the corresponding conductive strategy is...

Two-dimensional (2D) gallium nitride (GaN) has attracted a lot of attention due to its promising applications in photoelectric nano-devices. Most of previous researches focus on the polar c-plane 2D structures. Here, employing first principle calculations, we systematically investigate the structural and electronic properties of non-polar m-plane G...

Lens arrays are introduced to diminish the total internal reflection (TIR) that happens at chip-encapsulant and encapsulant-air interfaces of chip-on-board light-emitting diodes (COB-LEDs), so as to improve the light extraction efficiency (LEE) of the COB-LEDs. However, the LEE of COB-LEDs with lens array depends on the refractive index of the enca...

Phase-change materials (PCMs) have attracted numerous attentions in thermal energy storage area due to their high latent heat capacity. However, their inherently low thermal conductivity and potential leakage risk severely decrease the thermal storage efficiency. In this study, thermally-enhanced nanoencapsulated phase change materials (NEPCMs) wer...

Liquid cooling garments (LCGs) are considered feasible cooling equipment to protect individuals from hyperthermia and heat-related illness when working in extremely hot and stressful environments. So far, the goals for the optimization design of LCGs are mostly from the perspective of enhancing its efficiency and working time. However, thermal comf...

Thermal conductivity of material is one of the basic physical properties and plays an important role in manipulating thermal energy. In order to accelerate the prediction of material optimized structure with desired thermal property, machine learning algorithm has been widely combined with thermal conductivity calculation. However, in the optimizat...

Quantum dots (QDs)/phosphor hybrid white light emitting diodes (QDs-LEDs) have attracted extensive attention in recent years due to their advantages of high light efficiency and high color rendering index (CRI). However, the QDs present poor thermal and moisture stability, which hinders the commercialization of QDs-LEDs. The layered packaging struc...

The thermoelectric properties of monolayer Tl 2 O are studied using first-principles calculations with all involved electrical and thermal transport properties calculated in the parameter-free frameworks. It is found that monolayer Tl 2 O possesses remarkably high thermoelectric figure of merit, z T, due to its ultralow lattice thermal conductivity...

Recently, two Science papers tackled the challenge of harvesting low-grade heat via liquid thermocells. One combines TGC and TDC to significantly enhance thermopower by an order of magnitude, and the other reveals the selectively thermosensitive crystallization/dissolution at two electrodes. These intriguing and inspiring advances in terms of mater...

Quantum dot light-emitting diodes (QLEDs) possess huge potential in display due to their outstanding optoelectronic performance; however, serve degradation during operation blocks their practical applications. High temperature is regarded as one of major factors causing degradation. Therefore, a systematical study on the working temperature of QLED...

The conventional chip-on-board light-emitting diodes (COB-LEDs) with flat encapsulant layer present low light efficiency due to the total internal reflection (TIR) happens at the encapsulant-air interface. In this study, microlens array was realized on the flat encapsulant layer of COB-LEDs to diminish the TIR at the encapsulant-air interface. The...

Laser-driven white lighting has been considered as a next-generation high-brightness white lighting source. Thermally stable color converter is an essential down-conversion material for phosphor-converted white laser diodes (pc-wLDs), which inevitably endures high-density laser excitation and huge heat shock from conversion loss. In this work, we p...

The electrical transport properties of β-Ga2O3 are studied by first-principles calculations. The calculated intrinsic electron Hall mobilities agree well with experiments, with intrinsic Hall factor decreasing monotonically from 1.54 at 100 K to 1.14 at 800 K. The anisotropy of electron mobility is weak due to the almost isotropic electron effectiv...

The logging tools, which are widely utilized to detect the underground petroleum resources, are usually exposed to the high-temperature environment. Conventional thermal management system (CTMS) generally utilizes the vacuum flask for high-temperature insulation and phase change materials (PCMs) for centralized heat storage. As the heat sources inc...

The chip-on-board light-emitting diodes (COB-LEDs) present low light efficiency due to the total internal reflection (TIR) at the flat encapsulant–air interface. In this study, a simple method based on complementary printing was proposed to realize the millilens array on the flat encapsulant layer to diminish the TIR effect, and thereby improve the...

In polar compounds, Fröhlich interaction plays an important role in electrical transport, and it is highly dependent on the dimensionality. In two-dimensional (2D) materials, Fröhlich interaction cannot be correctly described by the analytical model available for bulk materials, which prevents the employment of the state-of-the-art first-principles...

In this work, we fabricated a phosphor-in-glass (PiG) film on Al-coated sapphire as reflective color converter driven by a laser diode. The borosilicate glass PiG film was sintered on heat-conducting sapphire and an Al thin layer with high reflectivity was deposited on the other surface of the sapphire, providing the function of heat dissipation an...

Thermal camouflage, which is used to conceal objects in the infrared vision for confrontation with infrared detection in civilian or military applications, has garnered increasing attraction and interest recently. Compared with conductive thermal camouflage, that is to tune heat conduction to achieve equivalent temperature fields, radiative thermal...

In this decade, the demands of energy saving and diverse personal thermoregulation requirements along with the emergence of wearable electronics and smart textiles give rise to the resurgence of personal thermal management (PTM) technologies. PTM, including personal cooling, heating, insulation, and thermoregulation, are far more flexible and exten...

Light-emitting diodes (LEDs) have gained wide adoption in general illumination applications in the last decade. However, the efficiency droop of LEDs with increasing current density limits the luminous flux per wafer area. In contrast, laser diodes (LDs) can achieve higher efficiency at high current density. Likewise, the etendue of LDs is very low...

Light-matter interaction upon nanophotonic structures in the infrared wavelength has drew increasing attentions due to the extensive potential applications. Among them, thermophotovoltaic (TPV) systems can exhibit higher efficiency over the Shockley-Queisser limit due to the nanophotonic structure-enabled tunable narrowband thermal emission rather...