【摘要】 面向市场对高功率照明的强烈需求,兼具优良光学和热/化学稳定性的全无机荧光玻璃陶瓷正蓬勃发展。本文基于低温共烧技术制备了一种镶嵌La₃Si₆N₁₁∶Ce³⁺（LSN∶Ce）荧光粉的硅基氮化物玻璃陶瓷荧光转换材料。研究表明,共烧时玻璃组分对LSN∶Ce荧光粉侵蚀作用较小,荧光粉结构未受明显破坏,因而其荧光特性基本得以保持——量子效率为79%,150℃下荧光积分强度仅下降～14%。构建的高功率白光LED光源在350 mA电流驱动下,光效为54.8 lm/W,色温为5 712 K,显指为70.1,色坐标为（0.328 0,0.369 0）。构建的激光照明光源在0.8 W蓝光激光激发下,光通量为118.48 lm,色温为7 427 K,显指为56.2,色坐标为（0.298 2,0.322 6）。我们推断,在高功率蓝光激光激发时,LSN∶Ce荧光玻璃陶瓷中发生了热饱和与光饱和现象。经进一步的材料组分、制备工艺以及器件结构优化,LSN∶Ce荧光玻璃陶瓷可望应用于高功率照明领域,如汽车大灯和探照灯等。更多还原

【Abstract】 Towards the strong market demand for high power lightings, the all-inorganic fluorescent glass ceramics with excellent optical property and thermal/chemical stability are booming. In this work, a silicon-based nitride glass ceramic fluorescent conversion material embedded with La₃Si₆N₁₁∶Ce³⁺（LSN∶Ce） phosphor was prepared based on a low temperature co-sintering method. It was demonstrated that LSN∶Ce phosphor was less corroded by glass components during co-sintering, with its structure showing no obvious change, and so, good luminescent properties were retained with quantum efficiency of 79% and fluorescence integral intensity decreased only by ～14% at 150 ℃. The fabricated high-power white LED lighting source yields luminous efficacy of 54.8 lm/W, CCT of 5 712 K, CRI of 70.1, and chromaticity coordinate of（0.328 0, 0.369 0）, upon 350 mA current driven. The constructed laser lighting source yields luminous flux of 118.48 lm, CCT of 7427 K,CRI of 56.2, and chromaticity coordinate of（0.298 2, 0.322 6）, under 0.8 W excitation power. It was speculated that the thermal and light saturation phenomena occur in LSN∶Ce fluorescent glass ceramics upon high-power blue laser excitation. After further optimization of material composition, preparation process, and device structure, LSN∶Ce fluorescent glass ceramics are expected to be applicable to high-power lighting fields, such as automobile headlights and searchlights, and so on.更多还原