Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 20, Pages 10656-10659Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b02212
Keywords
phosphors; chemical coprecipitation method; thermal stability; structural evolution; photoluminescent properties
Funding
- Industrial Technology Research Institute [D351A41300]
- Ministry of Science and Technology of Taiwan [MOST 101-2113-M-002-014-MY3]
- National Natural Science Foundation of China [51272151]
- Fundamental Research Fund for the Central Universities [GK201402052, GK201305013]
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This study explored optimal preparation conditions for K2GeF6:Mn4+ red phosphors by using chemical coprecipitation method. The prepared hexagonal P (3) over bar m1 K2GeF6:Mn4+ exhibited efficient red emission, high color purity, good Mn4+ concentration stability, and low thermal quenching. Structural evolution from hexagonal P (3) over bar m1 to P6(3)mc and then P6(3)mc to cubic Fm3m occurred after thermal treatment at approximately 400 and 500 degrees C, respectively. Hexagonal P6(3)mc 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 P (3) over bar m1 and P6(3)mc symmetries are promising commercial red phosphors for white light-emitting diodes.
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