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采用缩聚反应,通过将深蓝光荧光团(五联芴)和橙光荧光团(4-芴基-7-(4-二苯胺基-苯基)-2,1,3-苯并噻二唑)分别链接在聚芳醚的侧链上,合成了一种双色白光电致发光聚芳醚P1,接着将一种高效浅蓝光荧光团(2,7-二(9-乙基-咔唑乙烯基)芴)引入到了P1的侧链上,得到了聚芳醚P2和P3.系统研究了这些聚芳醚材料的溶解性、热稳定性、电化学性能、光物理性能和电致发光性能等.结果表明,所有聚芳醚都具有良好的溶解性与热稳定性;薄膜态时存在明显的由深蓝光荧光团到浅蓝光荧光团及橙光荧光团的能量转移;退火前后的薄膜光致发光光谱基本一致,表明具有优秀的光谱稳定性.基于这些聚芳醚的单层电致发光器件(ITO/PEDOT:PSS/高分子/Ca/Al),利用部分能量转移和电荷俘获作用,可以实现近白光发射.器件的最大电流效率可以达到7.96 cd/A,最大亮度为9950 cd/m2,色坐标为(0.33,0.44).
A polycondensation reaction was carried out using a polycondensation reaction of a deep blue fluorophore (pentafluorene) and an orange fluorophore (4-fluorenyl-7- (4-diphenylamino-phenyl) -2,1,3-benzothiadiazole ) Are respectively linked to the side chains of the polyarylene ether to synthesize a two-color white electroluminescent poly (aryl ether) P1, followed by an efficient light blue fluorophore (2,7-bis (9-ethyl- ) Fluorene was introduced into the side chain of P1 to obtain poly (arylene ether) P2 and P3.The solubility, thermal stability, electrochemical properties, photophysical properties and electroluminescent properties of these polyarylene ethers were studied systematically The results show that all the poly (aryl ether) s have good solubility and thermal stability, and there is a clear energy transfer from the deep blue fluorophore to the light blue fluorophore and the orange fluorophore in the thin film state. The luminescence spectra are basically the same, indicating good spectral stability. Based on these polyarylene single-layer electroluminescent devices (ITO / PEDOT: PSS / Polymer / Ca / Al), partial energy transfer and charge trapping can be used To achieve nearly white light emission.The maximum current efficiency of the device can reach 7.96 cd / A, the maximum brightness of 9950 cd / m2, color coordinates (0.33,0.44).