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首页> 外文期刊>Advanced Functional Materials >Mechanistic Study on High Efficiency Deep Blue AIE-Based Organic Light-Emitting Diodes by Magneto-Electroluminescence
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Mechanistic Study on High Efficiency Deep Blue AIE-Based Organic Light-Emitting Diodes by Magneto-Electroluminescence

机译：磁致发光法研究高效深蓝AIE基有机发光二极管的机理

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摘要

Aggregation-induced emission (AIE) materials are highly attractive because of their excellent properties of high efficiency emission in nondoped organic light-emitting diodes (OLEDs). Therefore, a deep understanding of the working mechanisms, further improving the electroluminescence (EL) efficiency of the resulting AIE-based OLEDs, is necessary. Herein, the conversion process from higher energy triplet state (T-2) to the lowest singlet state (SS1) is found in OLEDs based on a blue AIE material, 4 '-(4-(diphenylamino)phenyl)-5 '-phenyl-[1,1 ':2 ',1 ''-terphenyl]-4-carbonitrile (TPB-AC), obviously relating to the device efficiency, by magneto-EL (MEL) measurements. A special line shape with rise at low field and reduction at high field is observed. The phenomenon is further clarified by theoretical calculations, temperature-dependent MELs, and transient photoluminescence emission properties. On the basis of the T-2-S-1 conversion process, the EL performances of the blue OLEDs based on TPB-AC are further enhanced by introducing a phosphorescence doping emitter in the emitting layer, which effectively regulates the excitons on TPB-AC molecules. The maximum external quantum efficiency (EQE) reaches 7.93% and the EQE keeps 7.57% at the luminance of 1000 cd m(-2). This work establishes a physical insight for designing high-performance AIE materials and devices in the future.
机译：由于聚集诱导发射（AIE）材料在非掺杂有机发光二极管（OLED）中具有高效发射的出色特性，因此具有很高的吸引力。因此，必须深入了解工作机制，以进一步提高所得基于AIE的OLED的电致发光（EL）效率。在此，在基于蓝色AIE材料4'-（4-（二苯氨基）苯基）-5'-苯基的OLED中发现了从高能三重态（T-2）到最低单重态（SS1）的转化过程-[1,1'：2'，1'-三联苯] -4-腈（TPB-AC），通过磁电EL（MEL）测量，显然与器件效率有关。观察到一种特殊的线形，在低场时上升，在高场时下降。通过理论计算，与温度有关的MEL和瞬态光致发光特性进一步阐明了该现象。在T-2-S-1转换过程的基础上，通过在发射层中引入磷光掺杂发射极，可以有效地调节TPB-AC上的激子，从而进一步提高了基于TPB-AC的蓝色OLED的EL性能。分子。在1000 cd m（-2）的亮度下，最大外部量子效率（EQE）达到7.93％，EQE保持7.57％。这项工作为将来设计高性能AIE材料和设备建立了物理见解。

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