期刊
ADVANCED SCIENCE
卷 7, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/advs.201903060
关键词
antithermal quenching; color adjustment; Eu3+ -> Mn4+ energy transfer; red phosphor; white light emitting diodes (w-LEDs)
资金
- National Natural Science Foundation of China [51672259, 51720105015, 51932009, 51929201]
- Science and Technology Cooperation Project between Chinese and Australian Governments [2017YFE0132300]
- Distinguished Scientist Fellowship Program of King Saud University
- Ministry of Science and Technology of Taiwan
- MOST [107-2113-M-002-008-MY3]
Nowadays, red phosphor plays a key role in improving the lighting quality and color rendering index of phosphor-converted white light emitting diodes (w-LEDs). However, the development of thermally stable and highly efficient red phosphor is still a pivotal challenge. Herein, a new strategy to design antithermal-quenching red emission in Eu3+, Mn4+-codoped phosphors is proposed. The photoluminescence intensity of Mg3Y2(1-y)Ge3O12:yEu(3+), Mn4+ (0 <= y <= 1) phosphors continuously enhances with rising temperature from 298 to 523 K based on Eu3+ -> Mn4+ energy transfer. For Mg3Eu2Ge3O12:Mn4+ sample, the integrated intensity at 523 K remarkably reaches 120% of that at 298 K. Interestingly, through codoping Eu3+ and Mn4+ in Mg3Y2Ge3O12, the photoluminescence color is controllably tuned from orangish-red (610 nm) to deep-red (660 nm) light by changing Eu3+ concentration. The fabricated w-LEDs exhibit superior warm white light with low corrected color temperature (CCT = 4848 K) and high color rendering index (R-a = 96.2), indicating the promising red component for w-LED applications. Based on the abnormal increase in antistokes peaks of Mn4+ with temperatures, Mg3Eu2Ge3O12:Mn4+ phosphor also presents a potential application in optical thermometry sensors. This work initiates a new insight to construct thermally stable and spectra-tunable red phosphors for various optical applications.
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