Ultra-High Thermal-Stable Glass Phosphor Layer for Phosphor-Converted White Light-Emitting Diodes
Ultra-High Thermal-Stable Glass Phosphor Layer for Phosphor-Converted White Light-Emitting Diodes
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DOI：
10.1109/jdt.2012.2229258
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发表时间：
2013-02
影响因子：
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通讯作者：
Chun-Chin Tsai;W. Cheng;Jin-Kai Chang;Li-Yin Chen;Ji-Hung Chen;Y. Hsu;W. Cheng
中科院分区：
文献类型：
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作者：
Chun-Chin Tsai;W. Cheng;Jin-Kai Chang;Li-Yin Chen;Ji-Hung Chen;Y. Hsu;W. Cheng
A glass phosphor layer with ultra-high thermal stability appropriate for phosphor-converted white light-emitting diodes (PC-WLEDs) is demonstrated. The results showed PC-WLEDs utilizing the high thermal stable glass phosphor maintained good thermal stability in lumen, chromaticity, and transmittance characteristics under the thermal aging condition up to 350 $^{\circ}{\hbox{C}}$. This is a considerable high operating temperature for a phosphor layer in the PC-WLEDs. The lumen degradation, chromaticity shift, and transmittance loss in the glass-based PC-WLEDs under thermal aging at 150 $^{\circ}{\hbox{C}}$ , 250 $^{\circ}{\hbox{C}}$ , 350 $^{\circ}{\hbox{C}}$ , and 450 $^{\circ}{\hbox{C}}$ are also presented and compared with those of silicone-based PC-WLEDs under thermal aging at 150 $^{\circ}{\hbox{C}}$ and 250 $^{\circ}{\hbox{C}}$ . The result clearly demonstrated that the glass-based PC-WLEDs exhibited better thermal stability in lumen degradation, chromaticity shift, and transmittance loss than the silicone-based PC-WLEDs. The advantages of glass encapsulation in high-temperature operation of the PC-WLEDs could be explained that the glass transition temperature of the glass phosphor (567 $ ^{\circ}{\hbox{C}}$) was much higher than it of silicone (150 $ ^{\circ}{\hbox{C}}$). The newly developed ultra-high thermal-stable glass is essentially critical to the application of LED modules in the area where the high-power, high-temperature and absolute reliability are required for use in the next-generation solid-state lighting.
A glass phosphor layer with ultra-high thermal stability appropriate for phosphor-converted white light-emitting diodes (PC-WLEDs) is demonstrated. The results showed PC-WLEDs utilizing the high thermal stable glass phosphor maintained good thermal stability in lumen, chromaticity, and transmittance characteristics under the thermal aging condition up to 350 $^{\circ}{\hbox{C}}$. This is a considerable high operating temperature for a phosphor layer in the PC-WLEDs. The lumen degradation, chromaticity shift, and transmittance loss in the glass-based PC-WLEDs under thermal aging at 150 $^{\circ}{\hbox{C}}$ , 250 $^{\circ}{\hbox{C}}$ , 350 $^{\circ}{\hbox{C}}$ , and 450 $^{\circ}{\hbox{C}}$ are also presented and compared with those of silicone-based PC-WLEDs under thermal aging at 150 $^{\circ}{\hbox{C}}$ and 250 $^{\circ}{\hbox{C}}$ . The result clearly demonstrated that the glass-based PC-WLEDs exhibited better thermal stability in lumen degradation, chromaticity shift, and transmittance loss than the silicone-based PC-WLEDs. The advantages of glass encapsulation in high-temperature operation of the PC-WLEDs could be explained that the glass transition temperature of the glass phosphor (567 $ ^{\circ}{\hbox{C}}$) was much higher than it of silicone (150 $ ^{\circ}{\hbox{C}}$). The newly developed ultra-high thermal-stable glass is essentially critical to the application of LED modules in the area where the high-power, high-temperature and absolute reliability are required for use in the next-generation solid-state lighting.