Temperature dependence of Ce:YAG single-crystal phosphors for high-brightness white LEDs/LDs
Temperature dependence of Ce:YAG single-crystal phosphors for high-brightness white LEDs/LDs
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DOI：
10.1088/2053-1591/2/5/055503
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发表时间：
2015-05-01
影响因子：
2.3
通讯作者：
Shimamura, Kiyoshi
中科院分区：
文献类型：
--
作者：
Arjoca, Stelian;Villora, Encarnacinon G.;Shimamura, Kiyoshi
对提拉法生长Ce：Y3Al5O12(Ce：YAG)单晶荧光粉的偏析系数、溶解度和吸收截面进行了分析。在较宽的温度范围内，从液氦温度到500℃，研究了这些单晶的发射特性。单晶的内量子效率在250℃左右达到最大值。单晶在高温下的热猝灭归因于Mott-Seitz机制。对于陶瓷粉末荧光粉，由于缺陷相关的非辐射复合路径，随着温度的升高，观察到连续的下垂。结果表明，(Ce：YAGSCP+蓝光LED/LDS)可以覆盖5500~7000K的色温范围，显色指数在70左右。结果表明，Ce：YAGSCP是制作高亮度蓝光LED和LD高亮度白光光源的最有效和最稳定的转换器。
The growth of Ce:Y3Al5O12(Ce:YAG) single-crystal phosphors (SCPs) by the Czochralski technique is analyzed in terms of segregation coefficient, solubility and absorption cross-section. The emission characteristics of these SCPs are investigated in a wide temperature range, from liquid He temperature up to 500 degrees C. The internal quantum efficiency of SCPs achieves its maximum at about 250 degrees C. Thermal quenching of SCPs at high temperature is attributed to the Mott-Seitz mechanism. In the case of ceramic powder phosphors, a continuous droop is observed with the temperature due to defect-related non-radiative recombination paths. It is shown that (Ce:YAG SCPs + blue LEDs/LDs) can cover a wide range of color temperatures 5500-7000 K, with color rendering indices around 70. In conclusion, it is shown that Ce:YAG SCPs are the most efficient and temperature stable converters to fabricate high-brightness white light sources with high-power blue LEDs and LDs.