Extraction of Y sub(2)O sub(3):Cr super(3 +) nanophosphor by eco-friendly approach and its suitability for white light-emitting diode applications

Cr super(3) super(+)-doped Y sub(2)O sub(3) (0.5-9 mol%) was synthesized by a simple solution combustion method using Aloe vera gel as a fuel/surfactant. The final obtained product was calcined at 750 degree C for 3 h, which is the lowest temperature reported so far for the synthesis of this compoun...

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Bibliographic Details
Published in:Luminescence (Chichester, England) England), 2017-05, Vol.32 (3), p.414-424
Main Authors: Prasanna Kumar, JB, Ramgopal, G, Sunitha, D V, Prasad, BDaruka, Nagabhushana, H, Vidya, Y S, Anantharaju, K S, Prashantha, S C, Sharma, S C, Prabhakara, K R
Format: Article
Language:English
Subjects:
Aloe
Aloe vera
Combustion
Light emitting diodes
Nanostructure
Roasting
Synthesis
White light
Yttrium oxide
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Summary:Cr super(3) super(+)-doped Y sub(2)O sub(3) (0.5-9 mol%) was synthesized by a simple solution combustion method using Aloe vera gel as a fuel/surfactant. The final obtained product was calcined at 750 degree C for 3 h, which is the lowest temperature reported so far for the synthesis of this compound. The calcined product was confirmed for its crystallinity and purity by powder X-ray diffraction (PXRD) studies which showed a single-phase nano cubic phosphor. The particles size estimated by Scherrer formula was in the range of 6-19 nm. The UV-vis spectra showed absorption bands at 198, 272 and 372 nm having band gap energy in the range 4.00-4.26 eV. In order to investigate the possibility of its use in white light emitting display applications, the photoluminescence properties of Cr super(3) super(+)-doped Y sub(2)O sub(3) nanophosphors were studied at an excitation wavelength in the near ultraviolet (UV) light region (361 nm). The emission spectra consisted of emission peaks in the blue ( super(4)F sub(9) sub(/2 ) arrow right super(6)H sub(15) sub(/2)), orange ( super(4)F sub(9) sub(/2 ) arrow right super(6)H sub(13) sub(/2)) and red ( super(4)F sub(9) sub(/2 ) arrow right super(6)H sub(11) sub(/2)) regions. The CIE coordinates (0.33, 0.33) lie in the white light region. Hence Y sub(2)O sub(3):Cr super(3 ) super(+) can be used for white light-emitting diode (LED) applications.
ISSN:1522-7235
1522-7243
DOI:10.1002/bio.3197