期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 2, 页码 2130-2139出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b18103
关键词
Gd3Al4GaO12:Ce3+; transparent ceramic; high-power white LEDs; laser-driven lighting; warm white light
资金
- National Key Research and Development Program of China [2016YFC0101803, 2017YFB0404301]
- Public Projects of Zhejiang Province [LGG18E020007]
Transparent ceramics (TCs) are promising for high-power (hp) white light-emitting diode (WLED) and laser diode (LD) lighting. However, comfortable warm white light has not been achieved only using a single TC in hp-WLEDs/LDs. Herein, highly transparent Gd3Al4GaO12:Ce3+ (GAGG:Ce3+) TCs (transmittance, T = 55.9-80.2%) were prepared via a solid-state reaction. Ce3+ as a doped activator center in grains plays a positive role in luminescence based on the microstructural investigations by scanning electron microscopy and the cathodoluminescence system. T decreases upon increasing the Ce3+ concentration and/or the ceramic thickness, whereas the luminous efficacy of hp-WLEDs/LDs goes up. For blue hp-LEDs driven at 350 mA or LDs of 2 W, warm white light with a low correlated-color temperature of similar to 3000 K was achieved by a single GAGG:Ce3+ TC, benefiting from its broad emission band (full width at half maximum, FWHM = 133-137 nm) and abundant red components (peaking at about 568-574 nm). The color-rendering index of hp-WLEDs reaches 78.9. These results are much better than the performance of the traditional Y3Al5O12:Ce3+ (YAG:Ce3+) TC, indicating that GAGG:Ce3+ TCs are promising color converters for hp-WLEDs/LDs with a comfortable warm white light.
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