Here,
we develop an in situ photoluminescence (PL) system to monitor
the nucleation and growth of perovskite nanocrystals and control the
monomer supply rate to achieve strongly confined and monodispersed
quantum dots (QDs) with average size of 3.4 nm. Pure-blue (460 nm
wavelength) CsPbBr3 QDs with near unity PL quantum yield
and narrow size distribution (small size dispersion of 9.6%) were
thus produced. Light-emitting diodes (LEDs) based on these QDs were
prepared by using an all-solution processing route, which showed narrow
electroluminescence with full width at half-maximum of 20 nm and a
high color purity of 97.3%. The device also had a high external quantum
efficiency of 10.1%, maximum luminance of 11 610 cd m–2, and continuous operation lifetime of 21 h at the initial luminance
of 102 cd m–2, corresponding to the state-of-art
for pure-blue perovskite LEDs.
Quantum-dot (QD) light-emitting diodes (QLEDs) have promising application in the next-generation high-definition displays and solid-state lighting because of their high color purity, wide gamut, narrow emission band, and solution-processed characteristics....
Solution-processed quantum-dot light-emitting diodes (QLEDs) are attractive owing to high color purity and low-cost fabrication for large-area display panels, but the inferior carrier mobility of the organic polymer hole transport...
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