Fluorescent glass (PiG) has emerged as an important candidate material in the field of white light-emitting diode (WLED) illumination. However, its conventional preparation processes are often complex and time-consuming, resulting in a significant performance degradation during fabrication. In this study, we carefully designed a SiO2–P2O5–Al2O3–Na2O–K2O–BaO glass composition, which was combined with Y3Al5O12:Ce3+ (YAG:Ce) phosphor via a low-temperature stirring process at 750 °C. This approach aims to minimize the thermal and structural damage to the YAG:Ce phosphor, yielding high-quality fluorescent glass (PiG). For comparison, a control sample (S-PiG) was fabricated using the traditional sintering process, in which glass powder and the same amount of YAG:Ce phosphor were sintered in a muffle furnace. X-ray diffraction and scanning electron microscopy analyses revealed that the mild synthesis method produced fluorescent glass with a uniform microstructure and an ideal crystalline phase, both contributing to the enhanced luminescent efficiency and optical performance. Subsequently, both PiG and S-PiG were coupled to blue LED chips to fabricate WLED devices, and their photoluminescent properties were systematically investigated. The results demonstrated that the newly developed PiG exhibits an excellent luminescent performance under blue-light excitation, achieving an internal quantum efficiency as high as 88.03%. Its emission spectrum covers the ideal white-light region, with a luminous efficacy (LE) of 157.43 lm/W, a correlated color temperature of 6097 K, and CIE chromaticity coordinates of (0.3340, 0.3524). These findings indicate that the low-temperature stirring process effectively preserves the luminescent properties of YAG:Ce phosphors within PiG. This not only highlights the importance of this technique in enhancing the performance of YAG:Ce-based fluorescent glass but also provides a novel and practical approach for future WLED lighting applications.
To resolve the long-standing issues of thermal management, interfacial delamination, and efficiency loss in reflection-mode laser converters (such as phosphor-in-glass films and phosphor ceramic-substrate architectures), we developed a novel monolithic integrated ceramic (MIC) based on YAG:Ce, which eliminates the need for adhesives as well as the bonding interfaces formed by them and produces an inherently robust interfacial bonding with low thermal resistance and high delamination resistance. These modules were fabricated via a facile single-step solid-state reaction from bi-layered green pellets, consisting of an upper YAG:Ce phosphor layer and a lower alumina substrate layer. The integrated alumina substrate simultaneously performs three essential functions: robust mechanical support, efficient thermal management, and improved light reflection for the phosphor layer. This innovative design overcomes the interfacial bonding issue while optimizing both thermal and optical performance in a single cohesive structure. The saturation threshold, energy efficiency, and luminous exitance (spot confinement ability) of the as-prepared MIC modules were investigated using two testing modes, namely large-spot-mode (high laser power) and small-spot-mode (high laser power density). We validated and explained the critical role of phosphor layer thickness in light emission characteristics by evaluating its dependence on optoelectronic performance. These results conclusively demonstrate the MIC's exceptional capability for achieving ultra-high brightness and its potential for laser lighting applications.
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