Preparation of BaSi 2 O 2 N 2 :Eu 2+ cyan phosphor with excellent luminescence properties via heterogeneous precipitation method for high-CRI white LED applications

The BaSi 2 O 2 N 2 :Eu 2+ 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, BaSi 2 O 2 N 2 :Eu 2+ phosphors produced via traditional solid-state methods exhibit low quantum efficiency. Considerable efforts have been devoted to optimizing the luminescence characteristics of BaSi 2 O 2 N 2 :Eu 2+ . In the current work, BaSi 2 O 2 N 2 :Eu 2+ 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 BaSi 2 O 2 N 2 :Eu 2+ reached the level of commercial BaSi 2 O 2 N 2 :Eu 2+ phosphor. The external quantum efficiency of Ba 1.96 Si 2 O 2 N 2 :0.04Eu 2+ 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 BaSi 2 O 2 N 2 :Eu 2+ cyan phosphor for application in white LEDs with a high color rendering index.