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P‐178L: Late‐News Poster : Blue‐green BaSi 2 O 2 N 2 :Eu 2+ Phosphor for Light‐Emitting Diode
Author(s) -
Lim Seokgyu,
Park Seongwoo,
Deressa Gemechu,
Jeong Hyungseak,
Kim Hyunjong,
Kim Jongsu
Publication year - 2014
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2014.tb00347.x
Subject(s) - phosphor , light emitting diode , materials science , color rendering index , luminescence , color temperature , luminous efficacy , green light , analytical chemistry (journal) , optoelectronics , doping , irradiation , blue light , optics , chemistry , physics , nanotechnology , layer (electronics) , chromatography , nuclear physics
Oxynitride blue‐green‐emission BaSi 2 O 2 N 2 :Eu 2+ phosphors were synthesized at 1400°C under a reducing ambient through a solid‐sate reaction method. They showed the blue‐green emission peaking at 490–500 nm and narrow width (~32 nm) along with varying concentrations of from 2 to 10 mol %. It is due to 4f‐5d transition from Eu 2+ . XRD pattern showed a single phase of BaSi 2 O 2 N 2 structure. This enables silicon‐based BaSi 2 O 2 N 2 :Eu 2+ phosphors to be excited efficiently by UV or blue‐light irradiation, and then be applied as down‐conversion luminescent materials in white LEDs the class of oxynitride phosphors has demonstrated its superior suitability white LED can be used in bichromatic or multichromatic LEDs with excellent properties of high luminous efficiency, high chromatic stability, a wide range of white light with adjustable Correlated Color Temperature (CCT), and high color‐rendering properties [1]. A blue‐green BaSi 2 O 2 N 2 :Eu 2+ phosphors obtained high color rendering and high‐efficiency white LEDs (Ra 90, 70 lm/W).