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首页> 外文期刊>Advanced Functional Materials >Revealing the Interplay between Charge Transport, Luminescence Efficiency, and Morphology in Organic Light-Emitting Diode Blends
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Revealing the Interplay between Charge Transport, Luminescence Efficiency, and Morphology in Organic Light-Emitting Diode Blends

机译：揭示有机发光二极管混合物中电荷传输，发光效率和形态之间的相互作用

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Phosphorescent emissive materials in organic light-emitting diodes (OLEDs) manufactured using evaporation are usually blended with host materials at a concentration of 3-15 wt% to avoid concentration quenching of the luminescence. Here, experimental measurements of hole mobility and photoluminescence are related to the atomic level morphology of films created using atomistic nonequilibrium molecular dynamics simulations mimicking the evaporation process with similar guest concentrations as those used in operational test devices. For blends of fac-tris[2-phenylpyridinato-C2,N]iridium(III) [Ir(ppy)(3)] in tris(4-carbazoyl-9-ylphenyl)amine (TCTA), it is found that clustering of the Ir(ppy)(3) (surface of the molecules within approximate to 0.4 nm) in the simulated films is directly relatable to the experimentally-measured hole mobility. Films containing 1-10 wt% of Ir(ppy)(3) in TCTA have a mobility of up to two orders of magnitude lower (approximate to 10(-6) cm(2) V-1 s(-1)) than the neat TCTA film, which is consistent with the Ir(ppy)(3) molecules acting as hole traps due to their smaller ionization potential. Comparison of the simulated film morphologies with the measured photoluminescence properties shows that for luminescence quenching to occur, the Ir(ppy)(3) molecules have to have their ligands partially overlapping. Thus, the results show that the effect of guest interactions on charge transport and luminescence are markedly different for OLED light-emitting layers.
机译：通常将使用蒸发法制造的有机发光二极管（OLED）中的磷光发光材料与主体材料以3-15 wt％的浓度混合，以避免发光的浓度猝灭。在这里，空穴迁移率和光致发光的实验测量与使用原子非平衡分子动力学模拟模仿蒸发过程而产生的薄膜的原子级形态有关，该模拟模仿了与操作测试装置中使用的客体浓度相似的客体浓度。对于三（4-咔唑基-9-基苯基）胺（TCTA）中的fac-tris [2-苯基吡啶基-C2，N]铱（III）[Ir（ppy）（3）]共混物，发现模拟薄膜中的Ir（ppy）（3）（分子表面大约在0.4 nm内）与实验测量的空穴迁移率直接相关。 TCTA中含1-10 wt％Ir（ppy）（3）的薄膜的迁移率比迁移率低两个数量级（大约比10（-6）cm（2）V-1 s（-1）小）。整齐的TCTA膜，这与Ir（ppy）（3）分子由于其较小的电离势而充当空穴陷阱的现象是一致的。模拟薄膜形态与测量的光致发光性质的比较表明，要发生发光猝灭，Ir（ppy）（3）分子的配体必须部分重叠。因此，结果表明，对于OLED发光层，客体相互作用对电荷传输和发光的影响明显不同。

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