Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host

Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host
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以被低估的聚(N-乙烯基咔唑)为主体的界面三线态限制实现高效的溶液加工深蓝色和白色电致磷光器件

DOI:
10.1039/c3tc30912f
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发表时间:
2013-07
影响因子:
6.4
通讯作者:
Wang, Lixiang
Wang, Lixiang
中科院分区:
材料科学2区
文献类型:
--
作者:
Ding, Junqiao;Xie, Zhiyuan;Wong, Wai-Yeung;Wang, Lixiang

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利用高三重态能级界面层将三重态激子限制在发射层内,以FIr6为蓝色发射体,PVK为寄主,开发出了高效的深蓝和白色发光二极管。在PVK:FIr6发射层中加入具有更高三重态能级的界面层,如TPCz,可以有效地切断PVK:FIr6发射层中三重态激子的潜在损失途径。由此得到的PVK: fir6基深蓝和白色溶液处理的oled在实际亮度为1000 cd m−2时,分别具有16.1%的前视EQE和28.0% (38.4 lm W−1)的总EQE。
Highly efficient deep-blue and white PhOLEDs with FIr6 as a blue emitter and PVK as a host are developed by using a high triplet level interfacial layer to confine triplet excitons within the emissive layer. Incorporation of an interfacial layer with a higher triplet level such as TPCz can effectively cut off the potential loss pathways of the triplet excitons within the PVK:FIr6 emissive layer. The resultant PVK:FIr6-based deep-blue and white solution-processed PhOLEDs exhibit an unprecedented forward-viewing EQE of 16.1% and a total EQE of 28.0% (38.4 lm W−1) at a practical luminance of 1000 cd m−2, respectively.
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