Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910582
Keywords
core; shell nanocrystals; light-emitting diodes; optical stability; perovskite nanocrystals; quantum efficiency
Categories
Funding
- National Natural Science Foundation of China [51675322, 61605109, 61735004]
- National Key Research and Development Program of China [2016YFB0401702]
- Shanghai Science and Technology Committee [19010500600]
- Shanghai Rising-Star Program [17QA1401600]
- Science and Technology Commission of Shanghai Municipality Program [19DZ2281000, 17DZ2281700]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Engineering and Physical Sciences Research Council [EP/P03/1684/1]
- EPSRC [EP/P031684/1] Funding Source: UKRI
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Lead halide perovskite nanocrystals (PeNCs) are promising materials for applications in optoelectronics. However, their environmental instability remains to be addressed to enable their advancement into industry. Here the development of a novel synthesis method is reported for monodispersed PeNCs coated with all inorganic shell of cesium lead bromide (CsPbBr3) grown epitaxially on the surface of formamidinium lead bromide (FAPbBr(3)) NCs. The formed FAPbBr(3)/CsPbBr3 NCs have photoluminescence in the visible range 460-560 nm with narrow emission linewidth (20 nm) and high optical quantum yield, photoluminescence quantum yield (PLQY) up to 93%. The core/shell perovskites have enhanced optical stability under ambient conditions (70 d) and under ultraviolet radiation (50 h). The enhanced properties are attributed to overgrowth of FAPbBr(3) with all-inorganic CsPbBr3 shell, which acts as a protective layer and enables effective passivation of the surface defects. The use of these green-emitting core/shell FAPbBr(3)/CsPbBr3 NCs is demonstrated in light-emitting diodes (LEDs) and significant enhancement of their performance is achieved compared to core only FAPbBr(3)-LEDs. The maximum current efficiency observed in core/shell NC LED is 19.75 cd A(-1) and the external quantum efficiency of 8.1%, which are approximately four times and approximately eight times higher, respectively, compared to core-only devices.
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