Preparation of BaSi2O2N2:Eu2+ cyan phosphor with excellent luminescence properties via heterogeneous precipitation method for high-CRI white LED applications
College of Science, Nanjing Agricultural University, 210095, Nanjing, People’s Republic of China
2 Guangdong Keyu Optoelectronics Co., Ltd., 526542, Zhaoqing, People’s Republic of China
Accepted: 31 January 2024
Published online: 9 February 2024
The BaSi2O2N2:Eu2+ cyan-emitting phosphor can effectively enhance the color quality of white light-emitting diodes (LEDs) when it combined with red- and yellow-emitting phosphors. However, BaSi2O2N2:Eu2+ phosphors produced via traditional solid-state methods exhibit low quantum efficiency. Considerable efforts have been devoted to optimizing the luminescence characteristics of BaSi2O2N2:Eu2+. In the current work, BaSi2O2N2:Eu2+ phosphor was prepared via heterogeneous precipitation and thoroughly analyzed its thermal–humidity stability in view of practical applications. The main results show that the thermal–humidity stabilities of heterogeneous precipitation prepared BaSi2O2N2:Eu2+ reached the level of commercial BaSi2O2N2:Eu2+ phosphor. The external quantum efficiency of Ba1.96Si2O2N2:0.04Eu2+ phosphor prepared using our protocol exhibited 63%, which is outperformed the current commercial product. This study essentially provides an effective method for the preparation of the BaSi2O2N2:Eu2+ cyan phosphor for application in white LEDs with a high color rendering index.
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