期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 5, 期 34, 页码 8828-8835出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02514a
关键词
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资金
- Natural Science Foundation of China [21576056, 21576057]
- Natural Science Foundation of Guangdong Province [2016A030313305]
- Featured Innovation Project of Guangdong University [2016KTSCX107]
- Science and Technology Research Project of Guangdong Province [2016A010103043]
- Special Fund of Guangdong Province Project for Applied Science and Technology Research and Development [2016B090931007]
- Scientific Research Project of Guangzhou Municipal Colleges and Universities [1201431340]
- Guangzhou University's training program for young top-notch personnels [BJ201704]
The rational and delicate synthesis of Mn4+ activated red-emitting oxide phosphors with high photoluminescence quantum yield (PLQY) and photo-stability for developing high-quality w-LEDs still remains a great challenge. Herein, we demonstrate a simultaneous ion co-substitution design strategy to synthesize a red-emitting Lu3Al5O12:Mn4+,Mg2+ garnet phosphor delicately with the assistance of MgF2. The Mn4+ activated garnet phosphor exhibits superior moisture resistance properties and high PLQY (ca. 72.41%), which emits a bright and narrow-band red light peaking at similar to 670 nm due to the E-2-(4)A(2) spin-forbidden transition of Mn4+ upon UV excitation. Remarkably, MgF2 as a charge compensator & flux can not only accelerate the solid state reaction, but also greatly improve the emission intensity. Furthermore, by employing the as-prepared Lu3Al5O12: Mn4+, Mg2+ as a red component, we fabricate a warm w-LED with a high color rendering index (R-a = 81.4) and low color temperature (CCT = 4766 K) based on a UV chip and commercial blue and yellow phosphors.
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