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Trace alkali metal ions doped elpasolite K2LiAlF6:X+, Mn4+ (X = Li, Na, K) was studied as a red phosphor for white light emitting diodes (WLEDs). It exhibited red emission consisted of a series of narrow bands in the spectral range from 610 to 650 nm. The excitation bands were mainly centered at 360 nm and 465 nm, which matches well with emission of the UV and blue LED chips. The energy levels of...
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