In:
Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 16, No. 4 ( 2016-04-01), p. 3500-3505
Abstract:
Orange-red-emitting sodium yttrium orthosilicate NaYSiO 4 : x Sm 3+ ( x = 0.005, 0.01, 0.02, 0.05, 0.10, 0.15, and 0.20) were synthesized. The phase structure and photoluminescence properties of these phosphors were investigated. The emission spectrum obtained
by excitation into 406 nm contains exclusively the characteristic emissions of Sm 3+ at 571 nm, 602 nm, 648 nm, and 710 nm, which correspond to the transitions from 4 G 5/2 to 6 H 5/2 , 6 H 7/2 , 6 H 9/2 ,
and 6 H 11/2 of Sm 3+ , respectively. The strongest one is located at 602 nm due to the 4 G 5/2 → 6 H 7/2 transition of Sm 3+ , generating bright orange–red light. The optimum dopant concentration of Sm 3+ ions in NaYSiO 4 : x Sm 3+ is around 2 mol%, and the critical transfer distance of Sm 3+ is calculated as 23 Å. The thermal quenching temperature is above 500 K. The fluorescence lifetime of Sm 3+ in NaYSiO 4 :0.02Sm 3+ is
1.83 ms. The NaYSiO 4 :Sm 3+ phosphors may be potentially used as red phosphors for white light emitting diodes.
Type of Medium:
Online Resource
ISSN:
1533-4880
DOI:
10.1166/jnn.2016.11814
Language:
English
Publisher:
American Scientific Publishers
Publication Date:
2016
SSG:
11
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