The authors have demonstrated white light emission of rare earth (RE)-free Mn-doped SnO-ZnO-P(2)O(5) glass. The RE-free glass shows white light emission with a high value of quantum efficiency (QE) comparable to conventional crystalline phosphor. It is notable that the high QE value is attained for RE-free transparent glass, and the broad emission can be continuously tuned by both the amount of activator and the composition of the glass. Since this glass possesses low-melting property, we emphasize that the glass phosphor will lead to the development of a novel inorganic white-light-emitting device in combination with a solid state UV light-emitting source.
"Nano-structured optical materials have attracted great attention due to their potential applications in high-performance photonic and bio-photonic fields   . Among these materials, rare earth (RE) doped nanomaterials are widely investigated due to excellent luminescence characteristics arising from 4f–4f transitions , giving rise to long luminescence lifetimes and low absorptions, which have clear advantages in applications of lasers, optical amplifiers and phosphors   . "
[Show abstract][Hide abstract] ABSTRACT: The synthesis of Ho3 +–Yb3 + codoped titanate nanotubes was carried out successfully via a hydrothermal treatment method from a precursor powder. These novel nanotubes treated at RT, 100 °C and 280 °C were studied with the aim of determining their structural and optical properties. As the thermal treatment was increased, their upconversion emission becomes stronger. This behavior was related to reduction of hydroxyl groups and the water on the surface, which resulted in changes in the interlayer distances of the nanotubes.
[Show abstract][Hide abstract] ABSTRACT: Luminescent properties of Sb3+/Mn2+ co-doped borosilicate glasses containing no rare earth ions were systematically investigated through absorption, excitation, emission spectra, and decay curves. Upon 250-340 nm light excitation, the glasses exhibit broad blue emission at 400 nm (Sb3+) and red emission at 615 nm (Mn2+). The varied emitted color from blue through white and eventually to red can be obtained by properly tuning the content of Mn2+ ions due to energy transfer from Sb3+ to Mn2+. Our investigation shows that Sb3+/Mn2+ co-doped glasses may provide a new platform to design and fabricate luminescent materials for UV LED chips in the future. (C) 2012 Optical Society of America
[Show abstract][Hide abstract] ABSTRACT: The authors investigate the structural change of a ZnO–P2O5 sintered matrix for the preparation of SnO-doped zinc phosphate (SZP) glass using a platinum crucible. Heat treatment of zinc oxide and ammonium phosphate at 800°C causes the formation of a Zn2P2O7-like species, which is effective in preventing damage to the platinum crucible. Although the thermal property of the glass was affected by added Al2O3, Al2O3 hardly affects the quantum efficiency of the SZP glass phosphor. This process is important for the fabrication of contamination-free phosphate glass using ammonium phosphate as a starting material.
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