Preparation of BaSi2O2N2:Eu2+ cyan phosphor with excellent luminescence properties via heterogeneous precipitation method for high-CRI white LED applications.

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 Ba_1.96Si₂O₂N₂:0.04Eu²⁺ 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. [ABSTRACT FROM AUTHOR]