Abstract
This study explored optimal preparation conditions for K2GeF6:Mn4+ red phosphors by using chemical coprecipitation method. The prepared hexagonal P3m1 K2GeF6:Mn4+ exhibited efficient red emission, high color purity, good Mn4+ concentration stability, and low thermal quenching. Structural evolution from hexagonal P3m1 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:Mn4+ with both hexagonal P3m1 and P63mc symmetries are promising commercial red phosphors for white light-emitting diodes. (Figure Presented)
Original language | English |
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Pages (from-to) | 10656-10659 |
Number of pages | 4 |
Journal | ACS Applied Materials and Interfaces |
Volume | 7 |
Issue number | 20 |
DOIs | |
Publication status | Published - May 27 2015 |
Externally published | Yes |
Keywords
- chemical coprecipitation method
- phosphors
- photoluminescent properties
- structural evolution
- thermal stability
ASJC Scopus subject areas
- General Materials Science