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Strategies for Designing Antithermal-Quenching Red Phosphors.
Advanced Science ( IF 15.1 ) Pub Date : 2020-02-29 , DOI: 10.1002/advs.201903060 Yi Wei,Hang Yang,Zhiyu Gao,Yixin Liu,Gongcheng Xing,Peipei Dang,Abdulaziz A Al Kheraif,Guogang Li,Jun Lin,Ru-Shi Liu
Advanced Science ( IF 15.1 ) Pub Date : 2020-02-29 , DOI: 10.1002/advs.201903060 Yi Wei,Hang Yang,Zhiyu Gao,Yixin Liu,Gongcheng Xing,Peipei Dang,Abdulaziz A Al Kheraif,Guogang Li,Jun Lin,Ru-Shi Liu
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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:yEu3+, 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.
更新日期：2020-04-21
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