Journal
ACS NANO
Volume 12, Issue 8, Pages 8808-8816Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b05172
Keywords
perovskite nanocrystals; quantum dots; in situ fabrication; photoluminescence; light-emitting diode
Categories
Funding
- National Natural Science Foundation of China [61722502, 21603012, 61735004]
- BOE Technology Group Co., Ltd., China
Ask authors/readers for more resources
In this paper, we reported the in situ fabrication of highly luminescent formamidinium lead bromide (FAPbBr(3)) nanocrystal thin films by dropping toluene as an anti-solvent during the spin-coating with a perovskite precursor solution using 3,3-diphenylpropylamine bromide (DPPA-Br) as a ligand. The resulting films are uniform and composed of 5-20 nm FAPbBr(3) perovskite nanocrystals. By monitoring the solvent mixing of anti-solvent and precursor solution on the substrates, we illustrated the difference between the ligand-assisted reprecipitation (LARP) process and the nanocrystal-pinning (NCP) process. This understanding provides a guideline for film optimization, and the optimized films obtained through the in situ LARP process exhibit strong photoluminescence emission at 528 nm, with quantum yields up to 78% and an average photoluminescence lifetime of 12.7 ns. In addition, an exciton binding energy of 57.5 meV was derived from the temperature-dependent photoluminescence measurement. More importantly, we achieved highly efficient pure green perovskite based light-emitting diode (PeLEDs) devices with an average external quantum efficiency (EQE) of 7.3% (maximum EQE is 16.3%) and an average current efficiency (CE) of 29.5 cd A(-1) (maximum CE is 66.3 cd A(-1)) by adapting a conventional device structure of ITO/PEDOT:PSS/TFB/perovskite film/TPBi/LiF/Al. It is expected that the in situ LARP process provides an effective methodology for the improvement of the performance of PeLEDs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available