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Cation-Engineered Narrow-Band Green Emitting Phosphor Toward High-Performance Laser-Driven Displays
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DOI：10.1002/lpor.71698.png)
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Abstract
En 中文
Wide color gamut and high brightness are critical performance metrics for advanced displays like projectors. Combining narrow-band green and red color converters with a blue laser-driven light source is one of the most effective solutions to achieve these goals. In this work, an efficient UCr4C4-type narrow-band green-emitting phosphor Cs2NaK(Li3SiO4)4:Eu2+ was obtained by partially substituting Na+ with Cs+ in cyan-emitting CsNa2K(Li3SiO4)4:Eu2+. This cation-substitution strategy preferentially directs Eu2+ ions to occupy the Na sites over the K sites, resulting in a transition from dual peaks at 485 and 527 nm to a single peak at 527 nm. The site occupation evolution mechanism of Eu2+ was investigated using Rietveld structural refinement, low-temperature transient and steady-state photoluminescence spectroscopy, and density functional theory (DFT) calculations. Under 450 nm excitation, Cs2NaK(Li3SiO4)4:Eu2+ phosphor demonstrates a high external quantum efficiency (EQE) of 38.1% and good thermal stability (emission intensity retains 84.5% @ 145°C). When fabricated into a color wheel and excited by a 450 nm blue laser with a power density of 27.1 W/mm2, the phosphor achieves a luminous flux of 1677.6 lm and a luminous efficacy of 98.7 lm/W, demonstrating its potential for laser-driven projection displays.
Keywords:
green phosphor
laser-driven display
UCr4C4
wide color gamut display
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