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Functional Inorganic Materials and Devices
Warm White Light with a High Color Rendering Index from a Single Gd3Al4GaO12:Ce3+ Transparent Ceramic for High-Power LEDs and LDs Shuang Liu, Peng Sun, Yongfu Liu, Tianliang Zhou, Shuxing Li, Rong-Jun Xie, Xin Xu, Rui Dong, Jun Jiang, and Haochuan Jiang ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b18103 • Publication Date (Web): 19 Dec 2018 Downloaded from http://pubs.acs.org on December 19, 2018
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ACS Applied Materials & Interfaces
Warm White Light with a High Color Rendering Index from a Single Gd3Al4GaO12:Ce3+ Transparent Ceramic for High-Power LEDs and LDs Shuang Liu,†, ‡, # Peng Sun,†, # Yongfu Liu,†, * Tianliang Zhou,¶ Shuxing Li,¶ Rong-Jun Xie,¶, * Xin Xu,§ Rui Dong, † Jun Jiang,† Haochuan Jiang,†, * †
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, PR China
‡
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, PR China
¶
College of Materials, Xiamen University, Xiamen, 361005, PR China
§
School of chemistry and materials science, University of Science and Technology of China, Hefei, 230026, PR China
#
These authors contributed equally to this work.
ABSTRACT: Transparent ceramics (TCs) are promising for high-power (hp) white light-emitting diodes (WLEDs) and laser diodes (LDs) lighting. However, comfortable warm white light has not been achieved only using a single TC in hpWLEDs/LDs. Herein, the 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 SEM and the cathodoluminescence (CL) system. T decreases with increasing the Ce3+ concentration and/or the ceramic thickness, whereas the luminous efficacy (LE) of hp-WLEDs/LDs goes up. For blue hpLEDs driven at 350 mA or LDs of 2 W, warm white light with a low correlated color temperature (CCT) of ~ 3000 K was achieved by the 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 (CRI) 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. KEYWORDS: Gd3Al4GaO12:Ce3+, transparent ceramic, high-power white LEDs, laser-driven lighting, warm white light
Introduction
With the development of hp-WLEDs and LDs lighting,1remote phosphors, such as glass ceramics4-6 or phosphors in glass,7-10 films,11-15 single crystals,16-20 and TCs,21-36 were proposed to overcome the degradation of luminous efficiency and lifetime of phosphors in resin or silicone induced by high temperature.4, 5, 37-39 The yellow-emitting YAG:Ce3+ TC is promising due to its high thermal conductivity, high mechanical strength, and high luminous efficiency.21, 22, 25-27 However, its deficient red emissive component results in a cool white light with a high CCT (> 6000 K) and a low CRI (
