Size Tunable ZnO Nanoparticles To Enhance Electron Injection in Solution Processed QLEDs

• DOI: 10.1021/acsphotonics.5b00267
• Publication Date: 2016-01-22T21:14:44Z
• Authors: Jiangyong Pan; Jing Chen; Qianqian Huang; Qasim Khan; Xiang Liu; Zhi Tao; Zichen Zhang; Wei Lei; Arokia Nathan
• Keywords: Quantum Efficiency; Electron Mobility

Quantum dot (QD) light-emitting diodes (LEDs) are a promising candidate for high-efficiency, color-saturated displays. This work reports on the size effect of sol–gel synthesized ZnO nanoparticles (NPs) in which sizes 2.9, 4.0, and 5.5 nm, were used as an electron transfer layer QLEDs. The NPs was estimated by transmission microscopy (TEM) its QLED performance investigated photoluminescence decay lifetime mobility NPs. It found that NP decreased from to 2.9 conductivity increased, whereby enhanced 7.2 × 10–4 cm2/V·s 4.8 10–3 increased 5.11 6.68 ns. A comparison effects shows best is achieved with nm sized ZnO, yields turn voltage 3.3 V, maximum current efficiency 12.5 cd/A, power 4.69 lm/W external quantum efficiencies (EQE) 4.2%. most likely due higher smaller NPs, facilitates QDs, along slow exciton dissociation QD result more favorable energy level alignment at interface adjacent emissive layer.