Phosphor‐in‐fluorescent‐glasses for high color rendering white light emitting diodes |
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| Authors: | Seungryeol Yi Woon Jin Chung Jong Heo |
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| Affiliation: | 1. Department of Materials Science and Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Korea;2. Institute for Rare Metals & Division of Advanced Materials Engineering, Kongju National University College of Engineering, Cheonan, Chungnam, Korea |
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| Abstract: | 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 Eu3+ in glass frits. Phosphor‐in‐glass composites were placed on UV‐light emitting diodes (UV‐LEDs) to generate white light. Pure white light with a luminous efficacy=58.4 lm/W, general color rendering index Ra=87 and special color rendering index for strong red R9=73 was realized with glass frits containing 7 mol% Eu2O3 and RGB ratio of 35:20:15. Luminous efficacy, Ra and R9 increased as red phosphors were replaced by red‐fluorescent glass frits. |
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| Keywords: | fluorescence glass optical materials/properties phosphors sinter/sintering |
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