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CHEMICAL PHYSICS LETTERS · 2021 · IF 2.328

Synthesis and mechanoluminescent properties of submicro-sized Y3Al5O12:Ce3+ particles

Jiazhi Li,Zhidong Ma,Fu Wang,Zhaofeng Wang

In this work, submicro-sized Y 3 Al 5 O 12 :Ce 3+ particles were synthesized via a coprecipitation method. When mechanical stimuli are applied, the submicro-sized Y 3 Al 5 O 12 :Ce 3+ can exhibit intense greenish-yellow mechanoluminescence. Different from the bulk Y 3 Al 5 O 12 :Ce 3+ synthesized by conventional solid-state method, the mechanoluminescence of the submicro-sized Y 3 Al 5 O 12 :Ce 3+ exhibits a trap-dependent behavior. The distinct spectral characteristics between photoluminescence and mechanoluminescence further suggest that distorted Ce 3+ sites could be generated under mechanical stimuli, and therefore the mechanoluminescent mechanisms of the submicro-sized Y 3 Al 5 O 12 :Ce 3+ are revealed.

研究领域: 材料科学 · 发光材料 · 力致发光 · 纳米材料合成

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Journal of Advanced Ceramics · 2022 ·Vol. 11 ·期 6 ·862-873 · IF 11.534

Patterned glass ceramic design for high-brightness high-color-quality laser-driven lightings

Huang Qiugui,Lin Hang,Wang Bo,Lin Shisheng,Wang Pengfei,Sui Ping,Xu Ju,Cheng Yao,Wang Yuansheng

Up-to-date laser-driven lightings confront a challenge of simultaneously achieving good photometric and chromatic performances. Herein, the coupling of “patterned package design” and “phosphor wheel” was proposed and demonstrated effectively to deal with this tough issue, based on a new architecture of CaAlSiN 3 :Eu 2+ (CASN:Eu) glass ceramic film (GCF) on Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce) GC plate. The fabricated composite has no interface between the two functional layers and retains the admirable luminescent features from CASN:Eu and YAG:Ce for the microstructural integrity during co-sintering. The studies on laser-microcrystalline interactions reveal that the luminescence saturation is almost determined by thermal quenching for YAG:Ce, but is ascribed to thermal/intensity quenching which are equally crucial for CASN:Eu. Benefiting from the elaborate architecture design, good color chromaticity tunability was obtained, and severe photon reabsorption was reduced. Moreover, accompanied with the rotation induced increase of thermal convection to air and pulse-like excitation, the constructed lighting engine under blue laser driven shows bright white light with luminous flux (LF) higher than 1000 lm, adjustable chromaticity from cool to warm, and improved color rendering index (CRI) approaching to 70.

CAS / MDL: 9004-57-3 8000-41-7

研究领域: 光学 · 材料科学 · 照明工程

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Synthesis and mechanoluminescent properties of submicro-sized Y3Al5O12:Ce3+ particles

Patterned glass ceramic design for high-brightness high-color-quality laser-driven lightings