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Thermally Stable Pyrochlore Y 2 Ti 2 O 7 : Eu 3+ Orange–Red Emitting Phosphors
Author(s) -
Dai Pengpeng,
Zhang Xintong,
Zhou Meng,
Li Xinghua,
Yang Jikai,
Sun Panpan,
Xu Changshan,
Liu Yichun
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04804.x
Subject(s) - phosphor , photoluminescence , luminescence , materials science , analytical chemistry (journal) , pyrochlore , doping , light emitting diode , orange (colour) , emission intensity , thermal stability , optoelectronics , chemistry , optics , physics , phase (matter) , organic chemistry , chromatography
Pyrochlore‐structured Y 2 Ti 2 O 7 doped with Eu 3+ activators via high‐temperature solid‐state reaction shows thermally stable orange‐red emission under near ultraviolet excitation. The concentration of Eu 3+ activators was observed to influence both the intensity and color point of photoluminescence of Y 2−x Ti 2 O 7 : x Eu 3+ phosphors. The optimal doping concentration is around x = 0.45 determined by photoluminescence intensity; at this concentration, the luminescence branch ratio R / O = I (5D 0 −7F 2 ) / I (5D 0 −7F 1 ) , named as the luminous intensity ratio of 5 D 0 – 7 F 2 (R) and 5 D 0 – 7 F 1 (O) transition is also at maximum, about 0.46. This orange–red emitting phosphor Y 1.55 Ti 2 O 7 :0.45 Eu 3+ shows excellent thermal stability in luminescence intensity, retaining 84% of room‐temperature luminescence at 250°C. Therefore, Y 1.55 Ti 2 O 7 :0.45 Eu 3+ phosphors may have great potential as an orange–red component for white light‐emitting diodes, especially for the high‐power devices.