Color Tuning in Cesium Lead Halide Nanocrystals via A-Site Substitution as an Alternative Method for Achieving Spectrally Stable Blue Perovskite Nanocrystal Light-Emitting Diodes

Ko, Pui Kei1; Chen, Dezhang1; Li, C. -H. Angus1; Chan, Christopher Chang Sing2; Sergeev, Aleksandr2; Ding, Pengbo1,3; Lam, Davy1; Ouyang, Boyu1; Guo, Liang3,4; Wong, Kam Sing2; Halpert, Jonathan E.1

2024-04-02

10.1021/acs.chemmater.4c00011

CHEMISTRY OF MATERIALS   影响因子和分区

0897-4756

1520-5002

Blue-emitting lead halide perovskite nanocrystals (NCs) continue to exhibit unstable emission spectra, resulting from halide migration effects that hinder the performance of blue NC light-emitting diodes (NC-LEDs). One method to avoid halide mixing while still attaining deeper blue emission with improved stability is to incorporate rubidium into the mixture of A-site ions. Here, we explore the impact of varying the amount of rubidium doping in lead halide perovskite NCs. Our findings indicate that the rubidium-doping ratio influences the number of defects in the perovskite NCs, ultimately affecting the degree of blue shift we observe and the resulting performance of the NC-LEDs. Additionally, this study presents a modified room-temperature, open-air synthesis of sky-blue perovskite CsxRb1-xPbBr3 NCs with 0 to 45% Rb-alloying. The synthesized NCs have sizes ranging from 13.0 to 15.6 nm, and their emission can be adjusted from 515 to 496 nm with an observed full width at half-maximum of between 19 and 26 nm. These NCs also demonstrate a high photoluminescence quantum yield ranging from 94.5 to 69.7%. The NC-LEDs fabricated from these NCs showed stable spectra, a maximum external quantum efficiency (EQE) of 11.0% with a peak luminescence of 32,300 cd/m(2) at 508 nm for green emission, and a maximum EQE of 5.9% with a peak luminescence of 21,700 cd/m(2) at 496 nm for sky-blue emission. These results highlight the potential of Rb-alloying lead halide perovskite NCs for developing efficient and spectrally stable blue perovskite NC-LEDs.

SCI ; EI

英语

其他

National Natural Science Foundation of China[IRS22SC117] ; School of Science and Department of Chemistry at HKUST[16306020] ; Research Grants Council/University Grants Committee (RGC/UGC)[ITS/059/22MX] ; Innovation and Technology Commission (ITC)[52176075] ; Shenzhen Science and Technology Innovation Committee[JCYJ20210324115608024] ; Hong Kong Research Grant Council[C7035-20G]

Chemistry ; Materials Science

Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:001195944200001

AMER CHEMICAL SOC

MATERIALS SCIENCE

Web of Science

1.Hong Kong Univ Sci & Technol HKUST, Dept Chem, Hong Kong 999077, Peoples R China
2.Hong Kong Univ Sci & Technol HKUST, Dept Phys, Hong Kong 999077, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, SUSTech Energy Inst Carbon Neutral, Shenzhen 518055, Peoples R China

Ko, Pui Kei,Chen, Dezhang,Li, C. -H. Angus,et al. Color Tuning in Cesium Lead Halide Nanocrystals via A-Site Substitution as an Alternative Method for Achieving Spectrally Stable Blue Perovskite Nanocrystal Light-Emitting Diodes[J]. CHEMISTRY OF MATERIALS,2024,36(8).

Ko, Pui Kei.,Chen, Dezhang.,Li, C. -H. Angus.,Chan, Christopher Chang Sing.,Sergeev, Aleksandr.,...&Halpert, Jonathan E..(2024).Color Tuning in Cesium Lead Halide Nanocrystals via A-Site Substitution as an Alternative Method for Achieving Spectrally Stable Blue Perovskite Nanocrystal Light-Emitting Diodes.CHEMISTRY OF MATERIALS,36(8).

Ko, Pui Kei,et al."Color Tuning in Cesium Lead Halide Nanocrystals via A-Site Substitution as an Alternative Method for Achieving Spectrally Stable Blue Perovskite Nanocrystal Light-Emitting Diodes".CHEMISTRY OF MATERIALS 36.8(2024).