Phosphine-Oxide-Containing Bipolar Host Material for Blue Electrophosphorescent Devices
Phosphine-Oxide-Containing Bipolar Host Material for Blue Electrophosphorescent Devices
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DOI：
10.1021/cm802199d
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发表时间：
2009-02
影响因子：
8.6
通讯作者：
Fang-Ming Hsu;Chen‐Han Chien;Ping-I Shih;C. Shu
中科院分区：
文献类型：
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作者：
Fang-Ming Hsu;Chen‐Han Chien;Ping-I Shih;C. Shu
我们报道了高效的蓝色电磷光有机发光二极管（oled），其包含双极性主体，2,7-二（二苯基氧化膦）-9-（9-苯基咔唑-3-基）-9-苯基芴（PCF），掺杂铱（III）二[（4,6-二氟苯基）吡啶- n，C2 ']吡啶酸（FIrpic）。PCF包含二苯基膦氧化物基团，附加在咔唑/芴杂化物上，具有电子和空穴传输特性，导致低导通电压（2.6 V），大大提高了功率效率。此外，PCF的位阻结构为FIrpic掺杂提供了一个相容的环境，减轻了高掺杂水平下荧光粉的浓度猝灭。掺入28 wt % FIrpic的器件显示出30.8 cd/A和26.2 lm/W （121 cd/m2）的最大EL效率。即使在1000 cd/m2的高亮度下，效率仍然很高（26.9 cd/ a和19.6 lm/W）。
We report highly efficient blue electrophosphorescent organic light-emitting diodes (OLEDs) incorporating a bipolar host, 2,7-bis(diphenylphosphine oxide)-9-(9-phenylcarbazol-3-yl)-9-phenylfluorene (PCF), doped with iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C2′]picolinate (FIrpic). PCF, which contains diphenylphosphine oxide groups appended onto a carbazole/fluorene hybrid, displays both electron- and hole-transporting characteristics, resulting in a low turn-on voltage (2.6 V) and greatly improved power efficiencies. In addition, the sterically hindered structure of PCF provides a compatible environment for the FIrpic dopant, alleviating concentration quenching of the phosphor at high doping levels. The device doped with 28 wt % FIrpic exhibited maximum EL efficiencies of 30.8 cd/A and 26.2 lm/W (at 121 cd/m2). Even at a high brightness of 1000 cd/m2, the efficiencies remained high (26.9 cd/A and 19.6 lm/W).