| 초록 |
Laser diodes (LDs) are a new candidate for solid-state lighting in next generation. Light emitting diodes (LEDs) have been favored in solid-state light industry due to their long life, high efficiency, and being free of toxic materials along with having flexible designs compared with the conventional lighting sources. However, LEDs undergo saturation of output power with increasing forward-bias current leading to a deterioration of luminous efficacy. The general approach to realize white light is using yellow emitting Y3Al5O12: Ce3+ phosphors and blue light sources such as LEDs and LDs. The Y3Al5O12: Ce3+ absorbs the blue light and emits a down-converted yellow light2. The Y3Al5O12: Ce3+ is fabricated into pellet, which is called ceramic phosphor plate (CPP), to be used in high-power LDs. In this study, we fabricated Y3Al5O12: Ce3+ CPPs with different Ce3+ concentrations for stable operation without thermal quenching and degradation. With different Ce3+ concentrations, we optimized both luminous flux and conversion efficiency as well as critical thermal quenching points. |
