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- W4311307505 abstract "Abstract Achieving high efficiency and stable pure blue colloidal perovskite quantum dot (QD) light-emitting diodes (LEDs) is still an enormous challenge because blue emitters typically exhibit high defect density, low photoluminescence quantum yield (PLQY) and easy phase dissociation. Herein, an organic cation composition modification strategy is used to synthesize high-performance pure blue perovskite quantum dots at room temperature. The synthesized FA-CsPb(Cl 0.5 Br 0.5 ) 3 QDs show a bright photoluminescence with a high PLQY (65%), which is 6 times higher than the undoped samples. In addition, the photophysical properties of the FA cation doping was deeply illustrated through carrier dynamics and first principal calculation, which show lower defects, longer lifetime, and more reasonable band gap structure than undoped emitters. Consequently, pure blue FA-CsPb(Cl 0.5 Br 0.5 ) 3 QDs light-emitting devices were fabricated and presented a maximum luminance of 1452 cd m −2 , and an external quantum efficiency of 5.01 % with an emission at 474 nm. The excellent photoelectric properties mainly originate from the enhanced blue QDs emitter and effective charge injection and exciton radiation. Our finding underscores this easy and feasible room temperature doping approach as an alternative strategy to blue perovskite QD LED development." @default.
- W4311307505 created "2022-12-25" @default.
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- W4311307505 date "2022-12-14" @default.
- W4311307505 modified "2023-10-15" @default.
- W4311307505 title "High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling" @default.
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- W4311307505 doi "https://doi.org/10.1038/s41377-022-00992-5" @default.
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