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Improving Charge-Imbalanced Problem of Quantum Dot Light-Emitting Diodes With TPBi/ZnO Electron Transport Layer

Improving Charge-Imbalanced Problem of Quantum Dot Light-Emitting Diodes With TPBi/ZnO Electron Transport Layer

Sanghyun Lee, Junekyun Park, Jaewon Jeong, Jaehyun Kim, Juhyung Kim, Seokwon Jeong, Yonghan Roh

J Nanosci Nanotechnol. 2019 Oct 1;19(10):6152-6157.

PMID: 31026927

Abstract:

To solve charge-imbalanced problem caused by excessive electron injection into the emitting layer (EML) of quantum dot light emitting diodes (QLEDs) with ZnO electron transport layer (ETL), we proposed QLEDs with TPBi((2,2',2''-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)))/ZnO ETL layered design. Spin coated TPBi demonstrated lower value of the lowest unoccupied molecular orbital (LUMO) than conduction band maximum (CBM) of ZnO, resulting in effective prevention of excessive injection of electrons into the EML even under excessive stress conditions. Experimental results demonstrated that QLEDs with TPBi/ZnO ETL not only could minimize charge imbalanced problem under high current density operation, but also could increase the maximum luminance of QLEDs by up to 156% (i.e., from 10,320 to 16,081 cd/m²). In addition, the new design with TPBi resulted in low roll-off phenomenon in external quantum efficiency (EQE)-current density characteristics.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP192198859	TPBi		192198-85-9	Price

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