LED Phosphor Aging: Measurement Methods and Degradation (Review)
Project Laboratory, BME Department of Electron Devices · Budapest, Hungary · Autumn 2025 · Academic project · Individual, supervised
A supervised literature study at BME on how wavelength-converting phosphors in white LEDs age, and how that aging is measured, synthesizing more than 20 studies into a technology comparison.
- LEDs
- Phosphors
- Reliability
- Literature review
Overview
This is a review, not experimental work: a structured survey of phosphor degradation mechanisms in phosphor-converted white LEDs, the measurement techniques used to quantify them, and how packaging choices change the outcome, with a bibliometric analysis and a technology-readiness comparison across encapsulation approaches.
Results
- Synthesized findings such as silicone-YAG:Ce packages losing 7 to 12 percent flux after 500 hours at 150 C in the surveyed studies, versus under 3 percent for glass-ceramic converters
- Compared measurement approaches (thermal, optical, spectral) across the surveyed literature in a structured comparison table