Enhancing the cyan light emission of Ba9Lu2Si6O24:Ce phosphors by crystal-site engineering for full spectrum lighting
Xinjian He,
Shengjuan Li,
Mingxue Deng,
Yangmin Tang,
Machao Wang,
Cheng Wang,
Zhenzhen Zhou,
Jiang Li,
Jiacheng Wang
Affiliations
Xinjian He
State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China; School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, China
Shengjuan Li
School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, China; Corresponding author.
Mingxue Deng
State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
Yangmin Tang
State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
Machao Wang
State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
Cheng Wang
State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
Zhenzhen Zhou
Transparent Ceramics Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China; Corresponding author. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Jiang Li
Transparent Ceramics Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
Jiacheng Wang
State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China; Zhejiang Key Laboratory for Island Green Energy and New Materials, Institute of Electrochemistry, School of Materials Science and Engineering, Taizhou University, Taizhou, 318000, Zhejiang, China; Corresponding author. State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
Filling the cyan gap is the key element in achieving full-spectrum illumination using violet chip to excite red, green and blue phosphors. However, designing cyan phosphors suitable for violet light excitation with excellent performance remains challenging. Herein, a novel cyan phosphor Ba9Lu2-x-nSi6O24:xCe (n-BLS:Ce) with multiple crystal sites of Ba2+ and Lu3+ for Ce3+ ions was designed and prepared via crystal-site engineering. The Ce3+ ions at Ba2+ sites emit ultraviolet light at 385 nm under 325 nm ultraviolet light excitation, and the Ce3+ ions at Lu3+ sites emit cyan light at 485 nm under 395 nm violet light excitation. The favorable occupation of Ce3+ ions at Lu3+ sites could be realized by introducing Lu vacancies. Significantly, the cyan light emission intensity of Ba9Lu1.4Si6O24:0.3Ce (n0.3-BLS:Ce) with Lu vacancies is effectively improved by 47 % compared to Ba9Lu1.7Si6O24:0.3Ce (n0-BLS:Ce) without Lu vacancies. And the emission intensity at 150 °C retains 96 % of that at room temperature. The color rendering index increases from 87.9 to 94.5 after supplementing Ba9Lu2-x-nSi6O24:xCe cyan phosphor in w-LEDs devices combining commercial red, green, and blue phosphors with a violet chip, indicating its potential practical application in full-spectrum lighting. This work also provides new ideas for the design and development of new and efficient high-quality light-emitting materials.
