A robust yellow-emitting metallophosphor with electron-injection/-transporting traits for highly efficient white organic light-emitting diodes.
A robust yellow-emitting metallophosphor with electron-injection/-transporting traits for highly efficient white organic light-emitting diodes.
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DOI：
10.1002/cphc.201100259
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
Guijiang Zhou;Xiaolong Yang;W. Wong;Qi Wang;Si Suo;Dongge Ma;Jikang Feng;Lixiang Wang
中科院分区：
文献类型：
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作者：
Guijiang Zhou;Xiaolong Yang;W. Wong;Qi Wang;Si Suo;Dongge Ma;Jikang Feng;Lixiang Wang
为了使三重态发光体具有电子注入/传输（EI/ET）特性，在2-苯基吡啶（Hppy）配体的苯环上引入苯磺酰基，合成了黄色磷光杂配铱（III）配合物1。电化学和计算结果表明，SO（2）Ph单元可以为1提供EI/ET特征。配合物1是一种很有前途的用于单色OLED和白色OLED（WOLED）的黄光发射材料。1的优异电学特性，加上精心的器件设计，使双元WOLED具有非常吸引人的电致发光性能，包括小于3.7V的低开启电压，48, 000 cd m（-2）的最大亮度，13.0%的外量子效率，34.7cd A（-1）的亮度效率，功率效率为24.3LmW（-1）。此外，还获得了良好的显色指数（CRI）约为74，稳定的白色颜色，其CIE（x，y）变化Δ（x，y）< ±（0.02，0.02），以及高于5130 K的相关色温。这些令人鼓舞的结果表明，这些WOLED作为温暖的室内照明光源的良好候选者的潜力，以及这些关键的EI/ET特性对三重态发光体的关键贡献，以推进新的OLED研究。
With the aim of endowing triplet emitters in the development of organic light-emitting devices (OLEDs) with electron-injection/-transporting (EI/ET) features, the phenylsulfonyl moiety was introduced into the phenyl ring of a 2-phenylpyridine (Hppy) ligand and the yellow phosphorescent heteroleptic iridium(III) complex 1 was developed. It was shown that the SO(2)Ph unit could provide EI/ET character to 1, as indicated from both electrochemical and computational data. Complex 1 is a promising yellow-emitting material for both monochromatic OLEDs and white OLEDs (WOLEDs). The outstanding electronic traits associated with 1, coupled with careful device design, afforded very attractive electroluminescent performances for two-element WOLEDs, including a low turn-on voltage of less than 3.7 V, a maximum brightness of 48,000 cd m(-2), an external quantum efficiency of 13.0%, a luminance efficiency of 34.7 cd A(-1), and a power efficiency of 24.3 Lm W(-1). In addition, a good color rendering index (CRI) of about 74, a stable white color with a Commission Internationale de L'Eclairage (CIE(x,y)) variation of Δ(x, y) < ±(0.02, 0.02), and a correlated color temperature higher than 5130 K were obtained. These encouraging results indicate the potential of these WOLEDs as good candidates for warm indoor lighting sources, as well as the critical contribution of such key EI/ET properties to triplet emitters to advance new OLED research.