Structure and photoluminescence properties of nanocrystal Eu{sup 3+}-doped gadolinium tungsten red emitting phosphors excited by blue light
Journal Article
·
· Materials Research Bulletin
- School of Physics and Materials Science, Anhui University, Hefei 230039 (China)
Highlights: ► We get a series of Eu{sup 3+} doped tungstate phosphors with a wide range doping level. ► Different doping level leads to different crystal structures of final productions. ► Gd{sub 6}WO{sub 12}-like with a tetragonal lattice structure grows at low doping level. ► Gd{sub 2}WO{sub 6}-like with a monoclinic lattice structure grows at high doping level. ► The doping level at 40 mol% Eu{sup 3+} excited by blue light shows excellent red emission. -- Abstract: A co-precipitation reaction was used to prepare nanocrystal Gd{sub 6}WO{sub 12}:Eu{sup 3+} and Gd{sub 2}WO{sub 6}:Eu{sup 3+} red emitting phosphor powders with different Eu{sup 3+} doping levels. It is found that under the same preparation conditions, different doping level leads to different crystal structures; Gd{sub 6}WO{sub 12}-like with a tetragonal lattice structure tends to be synthesized at low doping level (10–40 mol%) yet Gd{sub 2}WO{sub 6}-like with a monoclinic lattice structure easily to grow at high doping level (60–80 mol%). The strong red emission of {sup 5}D{sub 0} → {sup 7}F{sub 2} transitions at 620 nm was observed for all powders under either near ultraviolet or blue light excited and the most intense emission was obtained at the concentration of 40 mol%. This kind of powders might find their promising application to compensate the white LEDs for the lack of red light component and to improve rendering index.
- OSTI ID:
- 22215599
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 47; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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