Owing to its low cost and high efficiency, the blue light-emitting diode (LED) chip covered with the Y₃Al₅O₁₂:Ce³⁺ (YAG) phosphor has become a mainstream technology of high power white LED packaging. However, phosphors are often susceptible to degradation under high-temperature and high-humidity conditions, which directly affects the optical and color stability of the white LED package. In this study, the moisture resistance of YAG phosphor was evaluated through both a short-term water-immersion test and long-term aging tests, i.e. 85 °C&85% Relative Humidity (RH) test and high-temperature and saturated humidity test. The phosphor hydrolysis mechanism was then revealed by characterizing the phosphor emission spectrum, photothermal property, crystal structure, micromorphology, and chemical element composition.

由于其低成本和高效率，被Y ₃ Al ₅ O ₁₂：Ce ³⁺覆盖的蓝色发光二极管（LED）芯片（YAG）荧光粉已成为高功率白光LED封装的主流技术。然而，磷光体在高温和高湿条件下通常易于降解，这直接影响白色LED封装的光学和颜色稳定性。在这项研究中，通过短期水浸测试和长期老化测试（即85°C＆85％相对湿度（RH）测试以及高温和饱和湿度测试）对YAG荧光粉的耐湿性进行了评估。然后通过表征磷光体的发射光谱，光热性质，晶体结构，微观形貌和化学元素组成来揭示磷光体的水解机理。