The development of pure-blue perovskite light-emitting
diodes (PeLEDs)
required for displays lags dramatically behind that of PeLEDs with
green and red emission. Mixed halide (Br/Cl) perovskite nanocrystals
(PeNCs) are commonly used to realize blue emission but are usually
accompanied by Cl vacancies and ion migration. In this work, a bifunctional
molecule was employed for the synthesis of high-quality CsPb(Br/Cl)3 PeNCs. Trichloro(1H,1H,2H,2H-tridecafluoro-n-octyl)silane
(PFTS), of which the Cl– ions function as the Cl-precursors
while the F– ions work as the surface passivator,
was explored, and the obtained products exhibited a high photoluminescence
quantum yield (PLQY) of 87%. Consequently, the LED fabricated with
the optimized PeNCs reached an external quantum efficiency of 1.62%
and luminance of 482 cd m–2 at the electroluminescence
wavelength of 461 nm. Simultaneously, the efficient halide vacancy
passivation by PFTS suppressed ion migration and hence dramatically
improved the spectral stability of the device.
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