通过界面工程提高具有TiO2电子注入层的倒置有机发光器件的效率,Journal of Materials Chemistry C

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通过界面工程提高具有TiO2电子注入层的倒置有机发光器件的效率
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-05-06 , DOI: 10.1039/d0tc01040e
Chunxiu Zang _{1,

2,

3,

4,

5} , Hui Wang _{1,

2,

3,

4,

5} , Shihao Liu _{1,

2,

3,

4,

5} , Wenbin Guo _{1,

2,

3,

4,

5} , Letian Zhang _{1,

2,

3,

4,

5} , Wenfa Xie _{1,

2,

3,

4,

5}

Affiliation

TiO ₂由于其优异的光学和电学性能而被广泛用于光电设备，尤其是有机太阳能电池。然而，其在作为电子注入层（EIL）的有机发光器件（OLED）中的应用通常遭受电子注入不足和严重的界面猝灭的困扰，导致效率低下。在这项工作中，报告了通过引入各种中间层（IL）来提高基于TiO ₂ EIL的倒置OLED（IOLED）的效率。聚乙烯亚胺（PEI），10,10'-[5-（6- [1,1'-联苯] -4-基-2-苯基-4-嘧啶基）-1,3-亚苯基]双[9,10-二氢-9,9-二甲基-啶]（DMAC-BPP）和2,2'，2''-（1,3,5-苯甲三基）-三（1-苯基-1- H-苯并咪唑（TPBI）被用作IL，以减少猝灭，通过达到阶梯式能级来改善电子注入并实现有效的激子约束。与使用PEI / TPBI中间层的设备相比，通过引入DMAC-BPP中间层，可以使基于TiO ₂的IOLED的最大外部量子效率（EQE _max）提高40％以上。此外，高效率的载流子限制和更平衡的载流子注入是通过将DMAC-BPP和所述发光层之间的薄TPBI（EML）实现的，并且然后，EQE_最大提高到17.68％，这是对于二氧化钛的最高记录₂ -基于IOLED。

"点击查看英文标题和摘要"

Efficiency enhancement in an inverted organic light-emitting device with a TiO2 electron injection layer through interfacial engineering

TiO₂ is widely used in optoelectronic devices especially organic solar cells due to its excellent optical and electrical properties. However, its application in organic light-emitting devices (OLEDs) as an electron injection layer (EIL) usually suffers from insufficient electron injection and serious interfacial quenching, leading to low efficiency. In this work, efficiency enhancement of inverted OLEDs (IOLEDs) based on a TiO₂ EIL by introducing various interlayers (ILs) is reported. Polyethylenimine (PEI), 10,10′-[5-(6-[1,1′-biphenyl]-4-yl-2-phenyl-4-pyrimidinyl)-1,3-phenylene] bis[9,10-dihydro-9,9-dimethyl-acridine] (DMAC-BPP) and 2,2′,2′′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBI) are adopted as ILs to reduce quenching, improve electron injection by achieving stepped energy levels and achieve efficient exciton confinement. Compared with devices using PEI/TPBI interlayers, over 40% enhancement of the maximum external quantum efficiency (EQE_max) for TiO₂-based IOLEDs by introducing DMAC-BPP interlayers is achieved. Furthermore, efficient carrier confinement and more balanced carrier injection are achieved by inserting a thin TPBI between DMAC-BPP and the emitting layer (EML), and then, the EQE_max is improved to 17.68%, which is the highest record for TiO₂-based IOLEDs.

更新日期：2020-06-25

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