Diarylmethylene-bridged 4,4′-(bis(9-carbazolyl))biphenyl: morphological stable host material for highly efficient electrophosphorescence
Diarylmethylene-bridged 4,4′-(bis(9-carbazolyl))biphenyl: morphological stable host material for highly efficient electrophosphorescence
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DOI：
10.1039/b910247g
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发表时间：
2009-10
影响因子：
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通讯作者：
Zuo‐Quan Jiang;Xichen Xu;Zhiqiang Zhang;Chuluo Yang;Zhongyin Liu;Youtian Tao;J. Qin;Dongge Ma
中科院分区：
文献类型：
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作者：
Zuo‐Quan Jiang;Xichen Xu;Zhiqiang Zhang;Chuluo Yang;Zhongyin Liu;Youtian Tao;J. Qin;Dongge Ma
以4，4 ′-（双（9-咔唑基））联苯（CBP）为主体材料，通过芳基亚甲基桥联的方法，合成了一种新型化合物（BCBP），并对其结构进行了表征。研究了其热学、电化学、电子吸收和光致发光等性质。由于引入了桥接结构，对于BCBP观察到173 °C的高玻璃化转变温度（Tg），与CBP的62 °C的低Tg形成显著对比。此外，桥接结构增强了共轭并提高了HOMO能量，从而促进了空穴注入并导致电致发光器件中的低开启电压。器件结构为ITO/MoO 3/NPB/Ir复合物：BCBP/BCP/Alq 3/LiF/Al，绿色和蓝色OLED的最大功率效率分别达到41.3 lm/W和6.3 lm/W。
A novel compound (BCBP) based on the modification of a well-known host material 4,4′-(bis(9-carbazolyl))biphenyl (CBP) through arylmethylene bridge linkage was synthesized, and fully characterized. Its thermal, electrochemical, electronic absorption and photoluminescent properties were studied. A high glass transition temperature (Tg) of 173 °C is observed for BCBP due to the introduction of the bridged structure, remarkably contrasting with a low Tg of 62 °C for CBP. Furthermore, the bridged structure enhances the conjugation and raises the HOMO energy, thus facilitating hole-injection and leading to a low turn-on voltage in an electroluminescent device. With the device structure of ITO/MoO3/NPB/Ir complex: BCBP/BCP/Alq3/LiF/Al, maximum power efficiencies of 41.3 lm/W and 6.3 lm/W for green- and blue-emitting OLED were achieved, respectively.