Self-defect-passivation by Br-enrichment in FA-doped Cs1-xFAxPbBr3 quantum dots: towards high-performance quantum dot light-emitting diodes.
Sci Rep
; 10(1): 14758, 2020 Sep 08.
Article
in En
| MEDLINE
| ID: mdl-32901051
ABSTRACT
Halide vacancy defect is one of the major origins of non-radiative recombination in the lead halide perovskite light emitting devices (LEDs). Hence the defect passivation is highly demanded for the high-performance perovskite LEDs. Here, we demonstrated that FA doping led to the enrichment of Br in Cs1-xFAxPbBr3 QDs. Due to the defect passivation by the enriched Br, the trap density in Cs1-xFAxPbBr3 significantly decreased after FA doping, and which improved the optical properties of Cs1-xFAxPbBr3 QDs and their QD-LEDs. PLQY of Cs1-xFAxPbBr3 QDs increased from 76.8% (x = 0) to 85.1% (x = 0.04), and Lmax and CEmax of Cs1-xFAxPbBr3 QD-LEDs were improved from Lmax = 2880 cd m-2 and CEmax = 1.98 cd A-1 (x = 0) to Lmax = 5200 cd m-2 and CEmax = 3.87 cd A-1 (x = 0.04). Cs1-xFAxPbBr3 QD-LED device structure was optimized by using PVK as a HTL and ZnO modified with b-PEI as an ETL. The energy band diagram of Cs1-xFAxPbBr3 QD-LEDs deduced by UPS analyses.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Sci Rep
Year:
2020
Document type:
Article
Affiliation country:
South Korea