Abstract
A blue-emitting SiO2:Eu2+ compound has been successfully synthesized and characterized. The PL intensity of SiO2:Eu0.0022+ compound is about 24 times higher than that of the O-defective SiO2 compound (without activators), which emits blue light. The valence state of the Eu ions responsible for the highly enhanced blue emission was determined to be Eu2+ using reference materials (EuCl2 and EuCl3) and XPS measurements. The Eu2+-activator ions occupied in the interstitial sites of the SiO2 matrix were confirmed by FT-IR, XPS, and 29Si MAS-NMR spectroscopy. Even though the void spaces formed structurally in both α-quartz and α-cristobalite can accommodate Eu2+ ions (ionic radius = 1.25 Å at CN = 8), SiO2:Eu2+ compound fired at 1300°C under a hydrogen atmosphere is destined to be deficient in O or Si atoms, indicating the formation of the wider void spaces in the SiO2 crystal lattice. A sputtered depth profile of SiO2-related compounds obtained by time-of-flight secondary ion mass spectrometry (TOF-SIMS) corroborates the O-defective SiO2 induced by hydrogen. In particular, the interatomic potentials, depending on the interstitial positions of Eu atoms in α-cristobalite and α-quartz, are calculated based on Lennard-Jones and coulomb potentials. For α-cristobalite, the minimum potential value is -51.47 eV and for α-quartz, the value is 221.8 eV, which reveals that the Eu2+-activator ions more preferably enter the interstitial sites of α-cristobalite than those of α-quartz. Thanks to the stable Eu2+-activator ions enclosed by Si-O linkages, the SiO2:Eu0.0022+ compound emits blue light and its PL emission intensity is about 24 times higher than that of the O-defective SiO2 compound. This phosphor material could be a platform for modeling a new phosphor and for application in the solid-state lighting field.
| Original language | English |
|---|---|
| Pages (from-to) | 74790-74801 |
| Number of pages | 12 |
| Journal | RSC Advances |
| Volume | 5 |
| Issue number | 91 |
| DOIs | |
| Publication status | Published - Aug 12 2015 |
Fingerprint
ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
Cite this
Blue-silica by Eu2+-activator occupied in interstitial sites. / Kim, Donghyeon; Jin, Yoeng Hun; Jeon, Ki Wan; Kim, Sungyun; Kim, Seung Joo; Han, Oc Hee; Seo, Dong Kyun; Park, Jung Chul.
In: RSC Advances, Vol. 5, No. 91, 12.08.2015, p. 74790-74801.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Blue-silica by Eu2+-activator occupied in interstitial sites
AU - Kim, Donghyeon
AU - Jin, Yoeng Hun
AU - Jeon, Ki Wan
AU - Kim, Sungyun
AU - Kim, Seung Joo
AU - Han, Oc Hee
AU - Seo, Dong Kyun
AU - Park, Jung Chul
PY - 2015/8/12
Y1 - 2015/8/12
N2 - A blue-emitting SiO2:Eu2+ compound has been successfully synthesized and characterized. The PL intensity of SiO2:Eu0.0022+ compound is about 24 times higher than that of the O-defective SiO2 compound (without activators), which emits blue light. The valence state of the Eu ions responsible for the highly enhanced blue emission was determined to be Eu2+ using reference materials (EuCl2 and EuCl3) and XPS measurements. The Eu2+-activator ions occupied in the interstitial sites of the SiO2 matrix were confirmed by FT-IR, XPS, and 29Si MAS-NMR spectroscopy. Even though the void spaces formed structurally in both α-quartz and α-cristobalite can accommodate Eu2+ ions (ionic radius = 1.25 Å at CN = 8), SiO2:Eu2+ compound fired at 1300°C under a hydrogen atmosphere is destined to be deficient in O or Si atoms, indicating the formation of the wider void spaces in the SiO2 crystal lattice. A sputtered depth profile of SiO2-related compounds obtained by time-of-flight secondary ion mass spectrometry (TOF-SIMS) corroborates the O-defective SiO2 induced by hydrogen. In particular, the interatomic potentials, depending on the interstitial positions of Eu atoms in α-cristobalite and α-quartz, are calculated based on Lennard-Jones and coulomb potentials. For α-cristobalite, the minimum potential value is -51.47 eV and for α-quartz, the value is 221.8 eV, which reveals that the Eu2+-activator ions more preferably enter the interstitial sites of α-cristobalite than those of α-quartz. Thanks to the stable Eu2+-activator ions enclosed by Si-O linkages, the SiO2:Eu0.0022+ compound emits blue light and its PL emission intensity is about 24 times higher than that of the O-defective SiO2 compound. This phosphor material could be a platform for modeling a new phosphor and for application in the solid-state lighting field.
AB - A blue-emitting SiO2:Eu2+ compound has been successfully synthesized and characterized. The PL intensity of SiO2:Eu0.0022+ compound is about 24 times higher than that of the O-defective SiO2 compound (without activators), which emits blue light. The valence state of the Eu ions responsible for the highly enhanced blue emission was determined to be Eu2+ using reference materials (EuCl2 and EuCl3) and XPS measurements. The Eu2+-activator ions occupied in the interstitial sites of the SiO2 matrix were confirmed by FT-IR, XPS, and 29Si MAS-NMR spectroscopy. Even though the void spaces formed structurally in both α-quartz and α-cristobalite can accommodate Eu2+ ions (ionic radius = 1.25 Å at CN = 8), SiO2:Eu2+ compound fired at 1300°C under a hydrogen atmosphere is destined to be deficient in O or Si atoms, indicating the formation of the wider void spaces in the SiO2 crystal lattice. A sputtered depth profile of SiO2-related compounds obtained by time-of-flight secondary ion mass spectrometry (TOF-SIMS) corroborates the O-defective SiO2 induced by hydrogen. In particular, the interatomic potentials, depending on the interstitial positions of Eu atoms in α-cristobalite and α-quartz, are calculated based on Lennard-Jones and coulomb potentials. For α-cristobalite, the minimum potential value is -51.47 eV and for α-quartz, the value is 221.8 eV, which reveals that the Eu2+-activator ions more preferably enter the interstitial sites of α-cristobalite than those of α-quartz. Thanks to the stable Eu2+-activator ions enclosed by Si-O linkages, the SiO2:Eu0.0022+ compound emits blue light and its PL emission intensity is about 24 times higher than that of the O-defective SiO2 compound. This phosphor material could be a platform for modeling a new phosphor and for application in the solid-state lighting field.
UR - http://www.scopus.com/inward/record.url?scp=84941243758&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84941243758&partnerID=8YFLogxK
U2 - 10.1039/c5ra15641f
DO - 10.1039/c5ra15641f
M3 - Article
AN - SCOPUS:84941243758
VL - 5
SP - 74790
EP - 74801
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 91
ER -