Key Takeaways & Executive Findings
- •• • Cs2O incorporation preserves 97.7% of pure YAG:Ce IQE, with absolute IQE of 88.3% after 1400°C/2h calcination, demonstrating exceptional thermal stability for high-power laser applications. • • Mixed alkali effect (10% Li2O + 5% Cs2O) enables PiSG to withstand hydrothermal treatment at 200°C for 10 h, addressing humidity-related degradation in practical devices. • • Optimized PiSG film on sapphire achieves 3080.09 lm luminous flux and 213.43 lm W−1 efficiency under blue laser excitation, outperforming conventional silicone-encapsulated phosphors in thermal management. • • High SiO2 content (>85 wt%) combined with Cs2CO3 flux promotes dense glass formation, suppressing interface reactions and maintaining structural integrity at sintering temperatures >1200°C.
Abstract
Phosphor-in-glass (PiG) materials are promising color converters for high-power laser illumination, yet suppressing interfacial reactions between phosphor and glass matrix at elevated sintering temperatures remains a critical challenge. Here, we report a Y3Al5O12:Ce3+ (YAG:Ce) phosphor-in-silica glass (PiSG) with high SiO2 content (>85 wt%) fabricated via a Cs2CO3 flux. Incorporation of Cs2O significantly inhibits SiO2-YAG:Ce reactions, preserving internal quantum efficiency (IQE) at 97.7% of pure YAG:Ce, and achieving 88.3% IQE even after calcination at 1400°C for 2 h. In contrast, smaller alkali ions (Li+, Na+) accelerate YAG:Ce decomposition. Mechanistic studies reveal that Cs+ with large ionic radius and weak interaction with oxygen suppresses non-bridging oxygen (NBO) formation, promoting a complete silica network that limits alkali ion diffusion. Leveraging the mixed alkali effect (10% Li2O + 5% Cs2O), the PiSG exhibits enhanced hydrothermal stability, withstanding 200°C treatment for 10 h. A PiG film-sapphire device delivers 3080 lm luminous flux and 213 lm W−1 efficiency under blue laser excitation. These findings establish YAG:Ce-PiSG as a highly promising color-conversion material for high-performance laser illumination.
1. Introduction
High-power laser-driven white light sources are indispensable in automotive, aviation, and deep-sea illumination, yet conventional organic silicone-encapsulated phosphors suffer catastrophic efficiency loss under intense laser irradiation due to thermal degradation. Inorganic phosphor-in-glass (PiG) composites offer superior thermal conductivity and stability, but their fabrication typically requires high-temperature sintering (>800°C), during which low-valent cations from the glass network migrate to phosphor surfaces, causing severe crystal damage and luminescence quenching. This interfacial reaction bottleneck has limited the practical adoption of PiG in high-power laser systems.
This study addresses the challenge by engineering a YAG:Ce phosphor-in-silica glass (PiSG) with high SiO2 content (>85 wt%). The strategic incorporation of Cs2CO3 as a flux not only lowers the melting temperature of nano-SiO2 but also, owing to the large ionic radius of Cs+ and its weak interaction with oxygen, suppresses non-bridging oxygen formation. This preserves a complete silica network that acts as a barrier against alkali ion diffusion, effectively inhibiting glass-phosphor reactions. Furthermore, the mixed alkali effect (10% Li2O + 5% Cs2O) enhances hydrothermal stability, enabling the PiSG to withstand 200°C/10h treatment. The resulting PiG film-sapphire device achieves 3080 lm luminous flux and 213 lm W−1 efficiency under blue laser excitation, demonstrating a viable path toward high-performance laser illumination.
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Gengli Chen, Shiyan Li, Wenli Zhou, Zezhong Yang, Pengyan Fu, Liping Yu, Shixun Lian, Jing Wang (2026). Interface Reaction Inhibition in Phosphor-in-Silica Glass for High-Performance Laser Illumination. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3969-9
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Frequently Asked Questions
What is the maximum operating temperature for the YAG:Ce-PiSG without significant IQE loss?
The YAG:Ce-PiSG retains 88.3% IQE even after calcination at 1400°C for 2 h, indicating exceptional thermal stability. This suggests it can withstand high-temperature sintering and high-power laser operation without severe degradation.
How does the mixed alkali effect improve hydrothermal stability, and what are the specific conditions?
The mixed alkali effect (10% Li2O + 5% Cs2O) enhances the PiSG's resistance to hydrothermal degradation, allowing it to withstand treatment at 200°C for 10 h. This is attributed to the synergistic effect of different alkali ions, which reduces ion mobility and stabilizes the glass network.
What is the luminous efficiency of the PiG film-sapphire device under blue laser excitation, and how does it compare to conventional phosphor converters?
The device achieves a luminous flux of 3080.09 lm and a luminous efficiency of 213.43 lm W−1 under blue laser excitation. This performance is superior to conventional silicone-encapsulated phosphors, which suffer from thermal quenching at high power densities.
What is the role of Cs2CO3 in the fabrication process, and how does it inhibit interface reactions?
Cs2CO3 acts as a flux to promote the melting of nano-SiO2, facilitating the formation of a dense, transparent glass matrix. The large ionic radius of Cs+ and its weak interaction with oxygen suppress the generation of non-bridging oxygen (NBO), leading to a complete silica network that prevents alkali metal ions from etching the YAG:Ce phosphor.
What are the potential scalability challenges for industrial production of YAG:Ce-PiSG?
The fabrication process involves high-temperature sintering (>1200°C) and precise control of alkali oxide composition. Scalability may require optimization of sintering conditions to maintain uniformity and reproducibility, but the use of common raw materials (SiO2, Cs2CO3, YAG:Ce) suggests cost-effective production potential.
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