2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors
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- 7 May 2007
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 90 (19) , 191101
- https://doi.org/10.1063/1.2737375
Abstract
Green α - sialon : Yb 2 + and red Sr 2 Si 5 N 8 : Eu 2 + oxynitride/nitride phosphors have been demonstrated as potential downconversion luminescent materials for white light-emitting diodes(LEDs). In this letter, the authors attempt to fabricate white LEDs by combining α - sialon : Yb 2 + and Sr 2 Si 5 N 8 : Eu 2 + with a blue LED die and report their optical properties. These two phosphors lend themselves for use in 2-phosphor-converted white LEDs with promising properties: a wide range of tunable correlated colortemperature ( 2700 – 6700 K ) , acceptable color rendering index (82–83), and luminous efficacy ( 17 – 23 lm ∕ W ) . These LEDs are acceptable for general lighting.Keywords
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