Application of an orange–yellow emitting cationic iridium(III) complex in GaN-based warm white light-emitting diodes
Application of an orange–yellow emitting cationic iridium(III) complex in GaN-based warm white light-emitting diodes
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DOI：
10.1007/s10854-017-8065-1
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发表时间：
2017
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影响因子：
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通讯作者：
Yan-chun Ye;Riyong Sun;Mingxian Chen;Huaijun Tang;Xueyan Dong;Kaimin Wang;Zhengliang Wang
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文献类型：
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作者：
Yan-chun Ye;Riyong Sun;Mingxian Chen;Huaijun Tang;Xueyan Dong;Kaimin Wang;Zhengliang Wang
一种橙黄色发光阳离子铱（III）配合物[(ptpy)2Ir(BCP)]PF6(ptpy: 2-（对苯基）吡啶；合成了BCP （bathocuproine）。[(ptpy)2Ir(BCP)] pf6在热分解温度为375℃时表现出较高的热稳定性，随着温度从20℃升高到100℃，[(ptpy)2Ir(BCP)] pf6的光致发光强度下降到79.9%。它可以被GaN芯片的蓝光（λmax= 457 nm）有效激发，并在不同浓度的有机硅中作为荧光粉混合制备了一系列GaN基发光二极管（led）。在1.0 wt.%时，可得到冷白光LED，相应的显色指数（CRI）为77.1，相关色温（CCT）为6278 K，发光效率（ηL）为68.4 lm W−1，国际照明委员会（CIE）值为（0.32,0.25）。在2.0 wt.%时，可得到中性白光LED，相应的CRI为74.2，CCT为4737 K，η l75.4 lm W−1，CIE值为（0.34,0.27）。在2.5、3.0、4.0和5.0 wt.%时，得到4个暖白光led，其中最大光度l85.8 lm W−1（4.0 wt.%时），最大显色指数73.7 （2.5 wt.%时），CCT在3410 ~ 2328 K之间变化，CIE值分别为（0.37,0.30）、（0.41,0.34）、（0.46,0.39）和（0.49,0.41）。结果表明[(ptpy)2Ir(BCP)] pf6是一种很有前途的白光led荧光粉候选者，特别是对于暖白光led。
An orange–yellow emitting cationic iridium(III) complex [(ptpy)2Ir(BCP)]PF6(ptpy: 2-(p-tolyl)pyridine; BCP: bathocuproine) was synthesized. [(ptpy)2Ir(BCP)]PF6exhibited high thermal stability with the thermal decomposition temperature (Td) of 375 °C, with the temperature increasing from 20 to 100 °C, the photoluminescent intensity of [(ptpy)2Ir(BCP)]PF6decreased to 79.9%. It can be efficiently excited by blue light (λmax= 457 nm) of GaN chip, and a series of GaN-based light-emitting diodes (LEDs) were fabricated by using it as phosphors blended in silicone at different blending concentrations. At 1.0 wt.%, a cold white LED was obtained, the corresponding color rendering index (CRI) was 77.1, correlated color temperature (CCT) was 6278 K, luminous efficiency (ηL) was 68.4 lm W−1, and Commission Internationale de L’Eclairage (CIE) value was (0.32, 0.25). At 2.0 wt.%, a neutral white LED was obtained, the corresponding CRI was 74.2, CCT was 4737 K,ηLwas 75.4 lm W−1, and CIE value was (0.34, 0.27). At 2.5, 3.0, 4.0 and 5.0 wt.%, four warm white LEDs were obtained, among them, the maximumηLwas 85.8 lm W−1(at 4.0 wt.%), the maximum CRI was 73.7 (at 2.5 wt.%), their CCT changed between 3410 K and 2328 K, the CIE values were (0.37, 0.30), (0.41, 0.34), (0.46, 0.39) and (0.49, 0.41) respectively. The results suggest [(ptpy)2Ir(BCP)]PF6is a promising phosphor candidate for white LEDs, especially for warm white LEDs.