Enhanced narrow green emission via efficient energy transfer from Eu2+ to Mn2+ in KAl4Ga7O17 for backlit LCD displays

Abstract

Wide color gamut displays are considered a new generation of display technology owing to their excellent color saturation and color rendition. However, a significant challenge in their development is obtaining narrow-band green-emitting phosphors with high quantum efficiency and low thermal quenching. Herein, we address this challenge by constructing efficient Eu2+ → Mn2+ energy transfer in the KAl4Ga7O17 matrix. This approach allows us to obtain a high quantum efficiency narrow-band green-emitting phosphor that can be excited by a UV LED chip. By achieving a 95.6% energy transfer efficiency of Eu2+ → Mn2+, the KAl4Ga7O17 : 0.1Eu2+,0.12Mn2+ (KAGO:0.1Eu2+,0.12Mn2+) phosphor exhibits nearly single-band emission peak at 509 nm with a full-width at half maximum (FWHM) of only 25 nm. Moreover, the internal quantum efficiency reaches 99% under 330 nm excitation. Compared with the undoped Ga sample, this phosphor demonstrates a 2.2 times increase in luminescence intensity. This improvement can be attributed to the introduction of Ga3+, enhancing the absorption of phosphors. Finally, as an application demonstration, we used KAl4Ga7O17:0.1Eu2+,0.12Mn2+ green phosphor, BaMgAl10O17:Eu2+ blue phosphor, and K2SiF6:Mn4+ red phosphor in combination with a 365 nm UV LED chip to encapsulate a white LED device, which gave a color gamut area of 122% NTSC and 91% Rec.2020 with a luminous efficacy of 27.09 lm W−1. Further, we fabricated a light bar and assembled it into an LCD screen. The fabricated LCD screen exhibited superior color rendition compared to ordinary commercial screens.

Graphical abstract: Enhanced narrow green emission via efficient energy transfer from Eu2+ to Mn2+ in KAl4Ga7O17 for backlit LCD displays

Supplementary files

Article information

Article type
Paper
Submitted
25 Mar 2024
Accepted
20 May 2024
First published
20 May 2024

J. Mater. Chem. C, 2024, Advance Article

Enhanced narrow green emission via efficient energy transfer from Eu2+ to Mn2+ in KAl4Ga7O17 for backlit LCD displays

B. Zhang, Z. Lu, H. Zhang, W. Li, J. Zhuang, C. Hu, Y. Liu, B. Lei and X. Zhang, J. Mater. Chem. C, 2024, Advance Article , DOI: 10.1039/D4TC01192A

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