Solution-processable highly efficient yellow- and red-emitting phosphorescent organic light emitting devices from a small molecule bipolar host and iridium complexes
作者:Youtian Tao、Qiang Wang、Chuluo Yang、Kai Zhang、Qi Wang、Taotao Zou、Jingui Qin、Dongge Ma
DOI:10.1039/b806306k
日期:——
A bipolar transport compound, 2,5-bis(4-(9-(2-ethylhexyl)-9H-carbazol-3-yl)phenyl)-1,3,4-oxadiazole (CzOXD), incorporating both electron- and hole-transport functionalities, was synthesized and fully characterized by 1H NMR, 13C NMR, elemental analysis and mass spectrometry. Its thermal, electrochemical, electronic absorption and photoluminescent properties were studied. The atomic force microscopy images indicate that smooth and homogeneous films can be obtained by spin-coating from a chloroform solution of CzOXD/iridium complex blends. Highly efficient small-molecule-based organic light emitting devices were fabricated by a wet process. With the device structure of ITO/PEDOT:PSS/Ir complex : CzOXD/BCP/Alq3/LiF/Al, a maximum luminance of 15232 cd m−2 and current efficiency of 20 cd A−1 for a yellow-emitting OLED, and 4896 cd m−2, 4.6 cd A−1 for a red-emitting OLED were achieved under ambient conditions.
一种双极性传输化合物2,5-bis(4-(9-(2-乙基己基)-9H-氮杂芴-3-基)苯基)-1,3,4-噁二唑(CzOXD)合成并通过1H NMR、13C NMR、元素分析和质谱进行了全面表征。其热学、电化学、电子吸收和光致发光特性进行了研究。原子力显微镜图像表明,通过从CzOXD/铱复合物混合物的氯仿溶液中旋涂,可以获得光滑且均匀的薄膜。通过湿法工艺制造了高效的小分子有机发光器件。在器件结构为ITO/PEDOT:PSS/Ir复合物:CzOXD/BCP/Alq3/LiF/Al的条件下,获得了最大亮度为15232 cd m−2和电流效率为20 cd A−1的黄色发光OLED,以及在环境条件下获得了4896 cd m−2和4.6 cd A−1的红色发光OLED。