https://scholars.lib.ntu.edu.tw/handle/123456789/575824
標題: | Strategies for Designing Antithermal-Quenching Red Phosphors | 作者: | Wei Y Yang H Gao Z Liu Y Xing G Dang P Kheraif A.A.A Li G Lin J Liu R.-S. RU-SHI LIU |
關鍵字: | Color; Energy transfer; Light emitting diodes; Photoluminescence; Quenching; Thermodynamic stability; Color adjustments; Color rendering index; High color rendering index; Integrated intensities; Optical applications; Photoluminescence intensities; Red phosphors; White light emitting diodes; Phosphors | 公開日期: | 2020 | 卷: | 7 | 期: | 8 | 來源出版物: | Advanced Science | 摘要: | 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 (Ra = 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. ? 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081032710&doi=10.1002%2fadvs.201903060&partnerID=40&md5=38aecf75cef71c8558c78ee6bb239dff https://scholars.lib.ntu.edu.tw/handle/123456789/575824 |
ISSN: | 21983844 | DOI: | 10.1002/advs.201903060 |
顯示於: | 化學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。