期刊
ACS APPLIED NANO MATERIALS
卷 6, 期 5, 页码 3797-3802出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c05498
关键词
indium phosphide; aminophosphine; quantum dots; color purity; electroluminescence
By using a safe phosphorus source, narrow bandwidth InP/ZnSeS/ZnS quantum dots with high photoluminescence quantum yield and narrow emission spectrum were synthesized, showing potential applications in high-performance display devices.
With tunable emission in the full visible region, the ecofriendly InP quantum dots (QDs) show unique application prospects in light-emitting devices. At present, InP QDs suffer from wide-bandwidth emission, especially for electroluminescence (EL), which hinders their applications in high-performance display devices. Here, we report a facile one-pot synthesis of narrow bandwidth InP/ZnSeS/ZnS QDs using a safe phosphorus source of tris(dimethylamino)phosphine, in which the ZnSeS inner-shell layer is formed via temperature-gradient solution growth from 240 to 280 degrees C. The synthesized green QDs have a high photoluminescence quantum yield (PLQY) of 91% and full width at half maximum (fwhm) of 36 nm. Moreover, the resultant quantum dot light-emitting devices (QLEDs) also show a narrow fwhm of 42 nm, which is the narrowest emission of green InP QLEDs based on a safe phosphorus source reported so far. Further modulation of the electron injection into the device by inserting a thin layer of lithium fluoride results in a peak external quantum efficiency of 5.56%.
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