Abstract
The formation of LiEuW2O8 from a tungsten source and acetates of lithium and europium(III) by autoclave treatment in 1 ,4butylene glycol, i.e., by a glycothermal reaction, was studied to explore a novel low-temperature wet chemical synthesis of scheelite-type tungstate compounds with WO4 units. When dodecatungstophosphoric acid hexahydrate (DPA) was chosen as a tungsten source, a glycothermal reaction at 300 °C produced crystalline scheelite-type LiEuW2O8 (LEW) nanophosphors in a single phase. In contrast, phase-pure crystalline LEW was not obtained using the other tungsten sources. According to the results obtained by inductively coupled plasma atomic emission spectroscopy, infrared absorption spectroscopy, and Raman spectroscopy, the DPA-derived sample contained PO4 groups, which had probably substitutionally replaced WO4. PO4 groups could play a significant role in the nucleation of scheelite-type LEW, which is composed of WO4 groups. We also discuss the nonstoichiometric structural properties of the crystalline scheelite-type LEW. LEW nanophosphors, which are an alternative for organic dyes, may be one of promising materials because of their optical function of color conversion from near UV and blue to red.
| Original language | English |
|---|---|
| Pages (from-to) | 5879-5884 |
| Number of pages | 6 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 46 |
| Issue number | 9 A |
| DOIs | |
| Publication status | Published - 2007 Sep 7 |
Fingerprint
Keywords
- Chemical synthesis
- Glycothermal reaction
- Luminescence materials
- Nanophosphor
- Scheelite-type structure
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
Glycothermal synthesis of scheelite-type LiEuW2O8 nanophosphors and their structural characterization. / Kasuya, Ryo; Isobe, Tetsuhiko; Yamao, Shinobu.
In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 46, No. 9 A, 07.09.2007, p. 5879-5884.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Glycothermal synthesis of scheelite-type LiEuW2O8 nanophosphors and their structural characterization
AU - Kasuya, Ryo
AU - Isobe, Tetsuhiko
AU - Yamao, Shinobu
PY - 2007/9/7
Y1 - 2007/9/7
N2 - The formation of LiEuW2O8 from a tungsten source and acetates of lithium and europium(III) by autoclave treatment in 1 ,4butylene glycol, i.e., by a glycothermal reaction, was studied to explore a novel low-temperature wet chemical synthesis of scheelite-type tungstate compounds with WO4 units. When dodecatungstophosphoric acid hexahydrate (DPA) was chosen as a tungsten source, a glycothermal reaction at 300 °C produced crystalline scheelite-type LiEuW2O8 (LEW) nanophosphors in a single phase. In contrast, phase-pure crystalline LEW was not obtained using the other tungsten sources. According to the results obtained by inductively coupled plasma atomic emission spectroscopy, infrared absorption spectroscopy, and Raman spectroscopy, the DPA-derived sample contained PO4 groups, which had probably substitutionally replaced WO4. PO4 groups could play a significant role in the nucleation of scheelite-type LEW, which is composed of WO4 groups. We also discuss the nonstoichiometric structural properties of the crystalline scheelite-type LEW. LEW nanophosphors, which are an alternative for organic dyes, may be one of promising materials because of their optical function of color conversion from near UV and blue to red.
AB - The formation of LiEuW2O8 from a tungsten source and acetates of lithium and europium(III) by autoclave treatment in 1 ,4butylene glycol, i.e., by a glycothermal reaction, was studied to explore a novel low-temperature wet chemical synthesis of scheelite-type tungstate compounds with WO4 units. When dodecatungstophosphoric acid hexahydrate (DPA) was chosen as a tungsten source, a glycothermal reaction at 300 °C produced crystalline scheelite-type LiEuW2O8 (LEW) nanophosphors in a single phase. In contrast, phase-pure crystalline LEW was not obtained using the other tungsten sources. According to the results obtained by inductively coupled plasma atomic emission spectroscopy, infrared absorption spectroscopy, and Raman spectroscopy, the DPA-derived sample contained PO4 groups, which had probably substitutionally replaced WO4. PO4 groups could play a significant role in the nucleation of scheelite-type LEW, which is composed of WO4 groups. We also discuss the nonstoichiometric structural properties of the crystalline scheelite-type LEW. LEW nanophosphors, which are an alternative for organic dyes, may be one of promising materials because of their optical function of color conversion from near UV and blue to red.
KW - Chemical synthesis
KW - Glycothermal reaction
KW - Luminescence materials
KW - Nanophosphor
KW - Scheelite-type structure
UR - http://www.scopus.com/inward/record.url?scp=34548706623&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548706623&partnerID=8YFLogxK
U2 - 10.1143/JJAP.46.5879
DO - 10.1143/JJAP.46.5879
M3 - Article
AN - SCOPUS:34548706623
VL - 46
SP - 5879
EP - 5884
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 9 A
ER -