New Ambipolar Hosts Based on Carbazole and 4,5-Diazafluorene Units for Highly Efficient Blue Phosphorescent OLEDs with Low Efficiency Roll-Off
New Ambipolar Hosts Based on Carbazole and 4,5-Diazafluorene Units for Highly Efficient Blue Phosphorescent OLEDs with Low Efficiency Roll-Off
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基于咔唑和 4,5-二氮杂芴单元的新型双极主体，用于低效率滚降的高效蓝色磷光 OLED
DOI：
10.1021/cm2036647
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发表时间：
2012-02
影响因子：
8.6
通讯作者：
C. S. Lee
中科院分区：
文献类型：
--
作者：
C. J. Zheng;J. Ye;M. F. Lo;M. K. Fung;X. M. Ou;X. H. Zhang;C. S. Lee
设计、合成并表征了两种双极性主体材料9，9-双（9-甲基咔唑-3-基）-4，5-二氮杂芘（MCAF）和9，9-双（9-苯基咔唑-3-基）-4，5-二氮杂芘（PCAF）。考虑到4，5-二氮杂芘单元的sp3杂化C9原子的非平面结构，MCAF和PCAF分别表现出2.82和2.83 eV的高三重态能级以及187和188 °C的高玻璃化转变温度。这两种化合物具有双极性输运性质以及合适的最高占据和最低未占据分子轨道能级，在蓝色磷光有机发光器件（PHOLED）中表现出色。MCAF基蓝光PHOLED具有2.6 V的极低开启电压、32.2 cd A-1的高电流效率、17.9%的高外量子效率、31.3 lm W-1的高功率效率和低效率滚降。
Two ambipolar host materials, 9,9-bis(9-methylcarbazol-3-yl)-4,5-diazafluorene (MCAF) and 9,9-bis(9-phenylcarbazaol-3-yl)-4,5-diazafluorene (PCAF), comprising two electron-donating carbazole units and an electron-accepting 4,5-diazafluorene group, have been designed, synthesized, and characterized. Given the nonplanar structure of the sp3-hybridized C9 atom of the 4,5-diazafluorene unit, MCAF and PCAF exhibit high triplet energy levels of 2.82 and 2.83 eV, as well as high glass-transition temperatures of 187 and 188 °C, respectively. Equipped with ambipolar transport properties as well as suitable highest occupied and lowest unoccupied molecular orbital energy levels, the two compounds excellently perform in blue phosphorescent organic light-emitting devices (PHOLEDs). The MCAF-based blue PHOLED has a very low turn-on voltage of 2.6 V, a high current efficiency of 32.2 cd A–1, a high external quantum efficiency of 17.9%, a high power efficiency of 31.3 lm W–1, and a low efficiency roll-off with a high eff...
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