Highly Thermally Stable Single-Component White-Emitting Silicate Glass for Organic-Resin-Free White-Light-Emitting Diodes
Highly Thermally Stable Single-Component White-Emitting Silicate Glass for Organic-Resin-Free White-Light-Emitting Diodes
复制标题
用于无有机树脂白光发光二极管的高热稳定性单组分白光硅酸盐玻璃
DOI：
10.1021/am405228x
复制
发表时间：
2014-02-26
影响因子：
9.5
通讯作者：
Su, Qiang
中科院分区：
文献类型：
--
作者：
Zhang, Xuejie;Huang, Lin;Su, Qiang
热管理对于用于未来普通照明的大功率磷光体转换白光发光二极管（pc-WLED）来说仍然是一个巨大的挑战。在本文中，一系列的单。组分白色发光硅酸盐SiO2-Li 2 O-SrO-Al 2 O3-K2 O-P2 O 5：Ce 3+，Tb 3+，Mn 2 +（SLSAKP：采用传统的熔淬法制备了同时作为发光转换体和WLED封装材料的关键玻璃，并对其吸收光谱、透射光谱、在296-498 K温度范围内的光致发光激发和发射光谱、衰减曲线和量子效率。该玻璃在250-380 nm区域显示出强而宽的吸收，并显示出强烈的白色发射，其分别由Ce 3+、Tb 3+和Mn 2+离子的蓝-紫色、绿色和橙-红色光在单一玻璃组分中原位混合产生。实验测得SLSAKP：0.3%Ce ~（3+），2.0%Tb ~（3+），2.0%Mn ~（2+）玻璃的量子效率为19%。更重要的是，该玻璃显示出良好的热稳定性，在373和423 K下分别表现出约84.56%和71.02%的所观察到的室温（298 K）发射强度。SLSAKP：0.3%Ce ~（3+），2.0%Tb ~（3+），2.0%Mn ~（2+）在498 K时的色移为2.94 × 10 ~（-2），仅为市售三基色白光荧光粉的57%。此外，与环氧树脂的82%透射率损失相比，该玻璃在热老化240小时后在板上紫外线芯片（UV-COB）的370 nm发射处没有显示透射率损失。玻璃的导热系数约为1.07 W/mK，远大于环氧树脂的0.17 W/mK。以SLSAKP：0.3%Ce ~（3+），2.0%Tb ~（3+），2.0%Mn ~（2+）玻璃和UV-COB为基质，成功制备了无有机树脂的WLED器件。我们的所有结果表明，所提出的Ce 3 +/Tb 3 +/Mn 2+三掺杂锂锶硅酸盐玻璃可以作为一个有前途的候选人，高功率WLED。
Thermal management is still a great challenge for high-power phosphor-converted white-light-emitting diodes (pc-WLEDs) intended for future general lighting. In this paper, a series of single. component white-emitting silicate SiO2-Li2O-SrO-Al2O3-K2O-P2O5: Ce3+, Tb3+, Mn2+ (SLSAKP: Ce3+, Tb3+, Mn2+) glasses that simultaneously play key roles as a luminescent convertor and an encapsulating material for WLEDs were prepared via the conventional melt-quenching method, and systematically studied using their absorption spectra, transmittance spectra, photoluminescence excitation and emission spectra in the temperature range 296-498 K, decay curves, and quantum efficiency. The glasses show strong and broad absorption in 250-380 nm region and exhibit intense white emission, produced by in situ mixing of blue-violet, green, and orange-red light from Ce3+, Tb3+, and Mn2+ ions, respectively, in a single glass component. The quantum efficiency of SLSAKP: 0.3%Ce3+, 2.0%Tb3+, 2.0%Mn2+ glass is determined to be 19%. More importantly, this glass shows good thermal stability, exhibiting at 373 and 423 K about 84.56 and 71.02%, respectively, of the observed room temperature (298 K) emission intensity. The chromaticity shift of SLSAKP: 0.3% Ce3+, 2.0%Tb3+, 2.0%Mn2+ is 2.94 X 10(-2) at 498 K, only 57% of the commercial triple-color white-emitting phosphor mixture. Additionally, this glass shows no transmittance loss at the 370 nm emission of a UV-Chip-On-Board (UV-COB) after thermal aging for 240 h, compared with the 82% transmittance loss of epoxy resin. The thermal conductivity of the glass is about 1.07 W/mK, much larger than the 0.17 W/mK of epoxy resin. An organic-resin-free WLEDs device based on SLSAKP: 0.3%Ce3+, 2.0% Tb3+, 2.0%Mn2+ glass and UV-COB is successfully demonstrated. All of our results demonstrate that the presented Ce3+/Tb3+/Mn2+ tridoped lithium-strontium-silicate glass may serve as a promising candidate for high-power WLEDs.