AI Article Synopsis
- Researchers developed a CsPbBr-coated poly(maleic anhydride-alt-1-octadecene) (CsPbBr/PMA) to enhance the stability of perovskite nanocrystals (PNCs) through a modified hot-injection method.
- The new PNCs showed a notable increase in green emission at 522 nm with a photoluminescence quantum yield of 86.8%, outperforming traditional CsPbBr PNCs at 54.2%.
- CsPbBr/PMA was successfully integrated into a white LED system, producing high-quality white light and demonstrating its potential as an efficient down-conversion material for lighting applications.
Article Abstract
In this study, to address the stability issues, we synthesized a CsPbBr-coated poly (maleic anhydride-alt-1-octadecene) (CsPbBr/PMA) using a modified hot-injection method. The CsPbBr/PMA perovskite nanocrystals (PNCs) exhibited effective green emission at 522 nm with an improved photoluminescence quantum yield (86.8 %) compared to traditional CsPbBr PNCs (54.2 %). The ligands in the polymer coating can bond with the uncoordinated Pb and Br ions on the surface of PNCs to minimize surface defects and avoid exposure to the external environment, enhancing the stability of the perovskites. Time-resolved photoluminescence spectra showed longer lifetimes for CsPbBr/PMA PNCs, while transient absorption measurements provided valuable insights into the intraband hot-exciton relaxation and recombination. We demonstrate the potential application of CSPbBr/PMA in a down-conversion white-light-emitting diode (LED) by coupling green CsPbBr/PMA and red KSiF:Mn phosphor-coated glass slides onto a 455-nm blue GaN LED. The white LED produced a white light with the International Commission on Illumination color coordinates of (0.323, 0.345), luminous efficiency of 58.4 lm/W, and color rendering index of 83.2. The fabricated, white-LED system obtained a wide color gamut of 125.3 % of the National Television Standards Committee and 98.9 % of Rec. 2020. The findings demonstrate that CsPbBr/PMA can be an efficient down-conversion material for white LEDs and backlighting.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10828704 | PMC |
| http://dx.doi.org/10.1016/j.heliyon.2024.e24497 | DOI Listing |
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