White‐Light‐Emitting Diodes Based on Iridium Complexes via Efficient Energy Transfer from a Conjugated Polymer
White‐Light‐Emitting Diodes Based on Iridium Complexes via Efficient Energy Transfer from a Conjugated Polymer
复制标题
DOI：
10.1002/adfm.200500621
复制
发表时间：
2006-03
影响因子：
19
通讯作者：
T. Kim;H. K. Lee-H. K.-Lee-2222315154;O. Park;B. Chin;S. Lee;J. K. Kim-J. K.-Kim-2160105415
中科院分区：
文献类型：
--
作者：
T. Kim;H. K. Lee-H. K.-Lee-2222315154;O. Park;B. Chin;S. Lee;J. K. Kim-J. K.-Kim-2160105415
使用掺杂有绿色和红色磷光染料的聚芴型蓝色发光共轭聚合物开发了高效的白色发光二极管（WLED）。该共轭聚合物的发射光谱具有非常高的发光效率，与绿色和红色铱配合物的吸收光谱有很大的重叠。此外，观察到从共轭聚合物到铱络合物的有效能量转移。聚（N-乙烯基咔唑）用于改善共轭聚合物与铱配合物之间的相容性，因为它们的化学相容性和相分离性较差。通过改变三种材料的含量和控制相形态，容易获得白色发射光谱。此外，这些WLED显示出电压无关的电致发光，这是由于三种材料的阈值和驱动电压由于能量转移而相似。
Efficient white‐light‐emitting diodes (WLEDs) have been developed using a polyfluorene‐type blue‐emitting conjugated polymer doped with green and red phosphorescent dyes. The emission spectrum of the conjugated polymer, which has a very high luminescent efficiency, shows a large spectral overlap with the absorbance of green and red iridium complexes. Also, efficient energy transfer from the conjugated polymer to the iridium complexes is observed. Poly(N‐vinyl carbazole) is used to improve the miscibility between conjugated polymer and iridium complexes because of their poor chemical compatibility and phase separation. A white emission spectrum is easily obtained by varying the contents of the three materials and controlling the phase morphology. Moreover, these WLEDs show a voltage‐independent electroluminescence owing to the threshold and driving voltage of the three materials being similar as a result of energy transfer.