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Updated: Apr 12, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Photoluminescent Evolution Induced by Structural Transformation Through Thermal Treating in the Red Narrow-Band
Ling-Ling Wei1, Chun Che Lin2, Yi-Ying Wang1
1†School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, P.R. China.
Abstract:
This study explored optimal preparation conditions for K2GeF6:Mn(4+) red phosphors by using chemical coprecipitation method. The prepared hexagonal P3̅m1 K2GeF6:Mn(4+) exhibited efficient red emission, high color purity, good Mn(4+) concentration stability, and low thermal quenching. Structural evolution from hexagonal P3̅m1 to P63mc and then P63mc to cubic Fm3m occurred after thermal treatment at approximately 400 and 500 °C, respectively. Hexagonal P63mc phase showed an obvious zero phonon line peak at 621 nm, whereas cubic Fm3m phase showed no red emission. Yellowish K2GeF6:Mn(4+) with both hexagonal P3̅m1 and P63mc symmetries are promising commercial red phosphors for white light-emitting diodes.
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