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Stoichiometry-Controlled InP-Based Quantum Dots: Synthesis, Photoluminescence, and Electroluminescence
- Li, Yang, Hou, Xiaoqi, Dai, Xingliang, Yao, Zhenlei, Lv, Liulin, Jin, Yizheng, Peng, Xiaogang
- Journal of the American Chemical Society 2019 v.141 no.16 pp. 6448-6452
- electrochemiluminescence, light emitting diodes, photoluminescence, quantum dots, stoichiometry, zinc sulfide
- We introduce stoichiometry control within both core and shell regions of InP/ZnSe/ZnS core/shell/shell quantum dots (QDs) to advance their properties drastically, approaching those of state-of-the-art CdSe-based QDs. The resulting QDs possess near-unity photoluminescence quantum yield, monoexponential decay dynamics, narrow line width, and nonblinking at a single-dot level. Quantum-dot light-emitting diodes (QLEDs) with the InP/ZnSe/ZnS core/shell/shell QDs as emitters exhibit a peak external quantum efficiency of 12.2% and a maximum brightness of >10 000 cd m–², greatly exceeding those of the Cd/Pb-free QLEDs reported in literature. These results pave the way toward Cd/Pb-free QDs as outstanding optical and optoelectronic materials.