Phosphor‐in‐fluorescent‐glasses for high color rendering white light emitting diodes

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Fluorescent glass frits were prepared and used to synthesize phosphor‐in‐fluorescent glass composites (PiFGs) to realize stable white light emitting diodes with high color‐rendering properties. Commercial red, green, and blue phosphors were co‐sintered and red phosphors were partially replaced by Eu 3+ in glass frits. Phosphor‐in‐glass composites were placed on UV ‐light emitting diodes ( UV ‐ LED s) to generate white light. Pure white light with a luminous efficacy=58.4 lm/W, general color rendering index R a =87 and special color rendering index for strong red R 9 =73 was realized with glass frits containing 7 mol% Eu 2 O 3 and RGB ratio of 35:20:15. Luminous efficacy, R a and R 9 increased as red phosphors were replaced by red‐fluorescent glass frits.