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

Abstract

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.

Application of dual-layer phosphor geometries for enhancing the optical properties of white-light LEDs

“…The following section will display the equations of the lightings of blue and yellow (transmitted and converted respectively) in the package of two-layer phosphor, which could lead to a considerable increase in the efficacy of LED. The blue and yellow light (transmitted and converted, respectively) of a one-layer remote phosphor (RP) package with a 2h-thick phosphor layer is shown in the ( 1) and ( 2) [24]- [26].…”

SiO2@LaOF:Eu3+ in white light emitting diodes optic efficiency enhancement

“…Furthermore, non-accumulated, ideal hemispheric molded atoms might be primed by fine-adjusting the testing conditions and production techniques, resulting in less scattered light, enhanced brightness, and excellent resolution. These characteristics are helpful for screen technologies, biomedical imagery, and anti-counterfeiting implementations [4]- [6]. Rare earth (RE) treated nano phosphors offer distinct features including crisp absorptivity with radiation streaks in the UV-V is range featuring strong quantum effectiveness, long lifetime and photo -resilience, great heating, and chemical stability, outstanding bio-adaptability, and non-virulence.…”