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Visible-Light-Driven Nd3+ Emission Enabled by a Garnet-Based Cr3+-Doped Phosphor–Glass Composite for Broadband-to-NIR Spectral Conversion
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DOI：10.1002/lpor.202502534.png)
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Abstract
En 中文
Conventional pulsed Nd-doped solid-state lasers (SSLs) typically employ broadband white-light lamps as the primary pump source, enabling the generation of high-energy laser outputs up to hundreds of joules. However, the limited spectral overlap between the visible-light emission and the absorption bands of Nd3+ ions hinders further system simplification and cost reduction. In this work, we present a spectrally matched phosphor, La3Sc2Ga3O12:Cr3+ (LSGG:Cr3+), which exhibits exceptional spectral alignment with the YAG:Nd3+ absorption band, facilitating efficient blue-to-near-infrared (NIR) optical down-conversion for resonant pumping of Nd3⁺ ions. Spectroscopic analyses identify an optimal Cr3+ doping concentration of 1 at.% and a phonon coupling energy of 21 meV, contributing to the phosphor's high internal quantum yield (>78%) and ensuring efficient optical conversion. To address thermal challenges, we developed a novel ultrathin (105 µm) phosphor-glass composite (PGC), which demonstrates superior thermal stability and maintains luminescent dynamics. When integrated with a broadband light source, the LSGG:Cr3+-based PGC converts poorly absorbed visible light into highly absorbable NIR light for Nd3+ ions, serving as an effective nonlinear spectral converter. This study establishes a promising energy-saving approach for broadband-pumped SSLs through advanced luminescent spectral engineering.
Keywords:
blue-light excitation
LEDs
Nd3+ emission
near-infrared optical converter
phosphor-glass composite
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