期刊
CHEMICAL ENGINEERING JOURNAL
卷 404, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126575
关键词
Nitride phosphor; Solid solution; Thermal quenching; Band gap; Laser lighting
资金
- National Natural Science Foundation of China [51832005, 51572232, 51802274]
- National Key Research and Development Program of China (MOST) [2017YFB0404301]
The study successfully addressed the thermal stability challenge in high-power solid-state lighting devices by designing a novel ternary solid solution phosphor CALSON:Ce, which exhibited excellent photoluminescence properties and thermal stability. This work suggests that creating multi-component solid solutions is an effective strategy for designing novel phosphors.
The discovery of thermally robust phosphors is essential to achieve efficient and stable luminescence in solidstate lighting devices, especial in high-power devices. Here, a novel ternary solid solution phosphor enabling to address this challenge is designed by introducing isostructural LiSi2N3 and Si2N2O into CaAlSiN3 lattice. The compound, Ca1-x-yLixAl1-x-ySi1+x+yN3-yOy:Ce3+ (CALSON:Ce), exhibits an excellent thermal stability with an integrated emission loss of only 9% at 200 degrees C, far smaller than that of the parent CaAlSiN3:Ce3+ (25%). The enhanced thermal stability is assigned to the broadened band gap (5.21 -> 5.50 eV) upon the formation of solid solutions. Moreover, the new phosphor presents a broadband (full width at half maximum of 135 nm) yellow orange emission peaking at 580 nm and shows a high external quantum efficiency of 41.5%. The excellent photoluminescence properties and thermal stability of CALSON:Ce thus enable it to be used under high-power laser excitation, and to produce high-brightness white light having a luminous flux of 392 lm (luminous emittance of 781 lm mm(-2)), a low correlated color temperature of 4349 K, and a high color rendering index of 70. This work suggests that creating multi-component solid solutions would be a general strategy for designing novel phosphors.
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