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Novel Bromide Quaternary Ammonium Ligand for Synthesizing High Fluorescence Efficiency CsPbBn Perovskite Quantum Dots and Their Fabrication of White Light-Emitting Diodes with Wide Color Gamut
摘要： We proposed a novel bromine quaternary ammonium ligand to synthesize high quantum yield (QY) CsPbBr3 quantum dots (QDs). The QY of CsPbBr3 QDs synthesized by this ligand reached 95% and the full width at half maximum (FWHM) was as narrow as 17nm. The peak wavelength of the prepared CsPbBr3 QDs was 530nm. And these QDs emitted high purity green light under ultraviolet light. The color coordinate of white LED (WLED) prepared with the CsPbBr3 QDs was (0.29, 0.31), which was very close to pure white light. The color gamut of the WLED covered 130% of the national television system committee (NTSC) color standard and 96% of the ITU-R Recommendation BT.2020 (Rec.2020) color standard.
关键词： CsPbBr3 Perovskite Quantum Dots,Bromide Quaternary Ammonium Ligand,Wide Color Gamut,White Light-Emitting Diodes
更新于2025-09-12 10:27:22
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Silver Nanoparticles Enhanced Luminescence and Stability of CsPbBr <sub/>3</sub> Perovskite Quantum Dots in Borosilicate Glass
摘要： Series of silver nanoparticles (NPs) embedded CsPbBr3 quantum dots (QDs) glass was synthesized via the melt-quench method. Ag NPs and CsPbBr3 QDs coexist in the TEM image of the Ag-doped glass sample. Photoluminescence (PL) spectra show that the 0.1 molar ratio Ag2O doped sample had a PL intensity 2.37 times than the undoped sample. This increase is generated by localized surface plasmon resonance coupling between the Ag NPs and CsPbBr3 QDs. Excessive Ag doping weakens the PL intensity due to spectral self-absorption of the Ag NP surface plasmon resonance (SPR). Self-adsorption of SPR is detrimental to luminescence properties because it increases the amount of photogenerated charge carriers which proceed through non-radiative relaxation pathways. In addition, stability results of Ag NP doped-CsPbBr3 QD glass show that they have excellent stability. This study on Ag NP doped-CsPbBr3 QD glass provides a new idea for the future development of perovskite QD optoelectronic devices.
关键词： Borosilicate glass,CsPbBr3 perovskite quantum dots,Luminescence,Stability,Silver nanoparticles
更新于2025-09-12 10:27:22