Ultrahigh‐Efficiency Green PHOLEDs with a Voltage under 3 V and a Power Efficiency of Nearly 110 lm W−1 at Luminance of 10 000 cd m−2,Advanced Materials

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Ultrahigh‐Efficiency Green PHOLEDs with a Voltage under 3 V and a Power Efficiency of Nearly 110 lm W−1 at Luminance of 10 000 cd m−2
Advanced Materials ( IF 27.4 ) Pub Date : 2017-09-05 , DOI: 10.1002/adma.201702847
Dongdong Zhang ₁ , Juan Qiao ₁ , Deqiang Zhang ₁ , Lian Duan ₁

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Maintaining high power efficiency (PE) under high brightness is still a pressing problem for the practical application of organic light‐emitting diodes (OLEDs). Here, ultrahigh‐efficiency green phosphorescent OLEDs (PHOLEDs) with a record‐low voltage at luminance above 5000 cd m⁻² are fabricated, by developing a novel anthracene/pyridine derivative as the electron‐transporting material (ETM) combined with a material displaying thermally activated delayed fluorescence as the host. The pyridine units of the ETM not only facilitate charge injection, but also enhance the electron‐transporting mobility, profiting from the closely packed molecules caused by the intermolecular H‐bonding. The optimized green PHOLEDs show record‐low driving voltages of 2.76 and 2.92 V, with EQEs/PEs of 28.0%/102 lm W⁻¹ and 27.9%/97 lm W⁻¹ at 5000 and 10 000 cd m⁻², respectively. Furthermore, device optimization exhibits an unprecedented high PE of 109 lm W⁻¹ at 10 000 cd m⁻² with voltage under 3 V. Those values are the state‐of‐the‐art among all reported green OLEDs so far, paving their way toward practical applications.

中文翻译：

电压低于3 V且在10000 cd m-2的亮度下的功率效率接近110 lm W-1的超高效绿色PHOLED

在有机发光二极管（OLED）的实际应用中，在高亮度下保持高功率效率（PE）仍然是一个紧迫的问题。在这里，通过开发新型的蒽/吡啶衍生物作为电子传输材料（ETM）并结合材料展示，制造了亮度在5000 cd m ^-2以上的记录低电压的超高效绿色磷光OLED（PHOLED）。热活化延迟荧光作为宿主。ETM的吡啶单元不仅促进了电荷注入，而且还增强了电子传输迁移率，这得益于分子间氢键引起的紧密堆积的分子。经过优化的绿色PHOLED显示出创纪录的低驱动电压2.76和2.92 V，EQE / PE为28.0％/ 102 lm W ^-1分别在5000和10000 cd m ^-2时为27.9％/ 97 lm W ^-1。此外，器件优化在30000 V以下的电压下，在10 000 cd m ^-2时表现出空前的109 lm W ^-1的高PE 。这些值是迄今为止所有已报道的绿色OLED的最新水平，为它们铺平了道路。走向实际应用。

更新日期：2017-09-05

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