Synergistic Regulation of Hole and Electron Transport Layers for Efficient Injection Balance in Deep Blue Quantum Dot Light-Emitting Diodes,ACS Materials Letters

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Synergistic Regulation of Hole and Electron Transport Layers for Efficient Injection Balance in Deep Blue Quantum Dot Light-Emitting Diodes
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-11-05 , DOI: 10.1021/acsmaterialslett.3c00955
Xinyu Zhang _{1,

2} , Shirong Wang _{1,

2} , Dewang Li _{3,

4} , Jingxiang Wang _{1,

2} , Hongli Liu _{1,

2}

Affiliation

The insufficient hole injection and excess electron injection unfortunately result in inferior performance in blue QLEDs. To study the predominant factors for hole injection, six different hole transport materials were investigated. The smaller energy barrier between the hole transport layer (HTL) and QDs dominates the injection, and high hole mobility further accelerates the process, which qualifies 4,4′-bis(3-vinyl-9H-carbazol-9-yl)-1,1′-biphenyl (CBP-V) as the most suitable HTL matrix. Simultaneously, moderate electron mobility reduction is also needed, which could be realized by PVP doping in the ZnO electron transport layer (ETL). The highly hole-mobile poly(9,9-dioctylfluorene-co-N-(4-(3-methylpropyl))diphenylamine) (TFB) was wrapped in the cross-linked CPB-V framework to further improve hole mobility and hole injection. The high level charge balance after the matching of 20 wt % TFB:CBP-V and 0.75 wt % PVP:ZnO enables high-performance blue QLEDs, with the EQE reaching 17.11% and the lifetime of 216 h at 100 cd/m². Our investigation builds a general principle of both HTL and ETL material regulation for high-level injection balance.

中文翻译：

空穴和电子传输层的协同调节以实现深蓝色量子点发光二极管的有效注入平衡

遗憾的是，空穴注入不足和电子注入过多导致蓝色 QLED 的性能较差。为了研究空穴注入的主导因素，研究了六种不同的空穴传输材料。空穴传输层 (HTL) 和 QD 之间较小的能垒主导了注入，而高空穴迁移率进一步加速了该过程，这符合 4,4'-bis(3-vinyl-9H-carbazol-9-yl)-1 ,1'-联苯 (CBP-V) 作为最合适的 HTL 基质。同时，还需要适度降低电子迁移率，这可以通过在ZnO电子传输层（ETL）中掺杂PVP来实现。将高空穴迁移率的聚(9,9-二辛基芴-co - N- (4-(3-甲基丙基))二苯胺)(TFB)包裹在交联的CPB-V骨架中，进一步提高空穴迁移率和空穴注入。20 wt% TFB:CBP-V 和 0.75 wt% PVP:ZnO 匹配后的高水平电荷平衡可实现高性能蓝色 QLED，EQE 达到 17.11%，100 cd/m 2 下的寿命为 216 ^h。我们的研究建立了 HTL 和 ETL 材料调节的一般原则，以实现高水平的注射平衡。

更新日期：2023-11-05

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