High recorded color rendering performance of single-structured Ce,Mn:Y <sub>3</sub>(Al,Sc) <sub>2</sub>Al <sub>3</sub>O <sub>12</sub> phosphor ceramics for high-power white LEDs/LDs
Xuanchu Liu, Congcong Yang, Yanbin Li, Chang Min, Jian Kang, Tianyuan Zhou, Chunming Zhou, Chaofan Shi, Cen Shao, Bingheng Sun, W. Stręk, Hao Chen, Le Zhang
Abstract
Achieving high color rendering index (CRI) and luminous stability in single-structured Ce:YAG phosphor ceramics (PCs) is crucial for high-power white light-emitting diodes or laser diodes (LEDs/LDs). However, cyan valley and insufficient red component of the Ce:YAG emission spectra significantly limit their real applications. In this work, a series of Ce,Mn:Y<sub>3</sub>(Al,Sc)<sub>2</sub>Al<sub>3</sub>O<sub>12</sub> (Ce,Mn:YSAG) PCs were fabricated by the vacuum sintering, and an efficient spectral regulation was realized for full-color lighting. The cyan valley was filled by blue-shifted emission peak of Ce<sup>3+</sup> via Sc<sup>3+</sup> doping. The orange-red emission around 580 nm was effectively supplemented via Mn<sup>2+</sup> doping. Particularly, the CRI of Ce,Mn:YSAG increased from 56.4 to 85.8 with a 52% increment compared with Ce:YAG under high-power LED excitation, and the operating temperature was stable at about 50 ℃ under long working time. Meanwhile, the CRI values of 80.9 could still be obtained in PC based white LDs. These results indicated that Ce,Mn:YSAG PC with excellent CRI and luminous stability is an extremely promising color convertor for high-power white LEDs/LDs.