Abstract
A series of orange-emitting Rb 2CaP 2O 7:Eu 2+ phosphors were synthesized by a conventional solid-state reaction method. The as-prepared phosphors were characterized by X-ray powder diffraction (XRD), fluorescence spectroscopy, and spectroradiometry. XRD showed that all prepared samples exhibited a monoclinic Rb 2CaP 2O 7 phase. Fluorescence spectroscopy showed that the photoluminescence efficiency of Rb 2Ca 1-xP 2O 7:Eu x 2+ phosphors increased with increasing Eu 2+ concentration until x = 0.006, then decreased at higher concentrations, due to a concentration quenching effect. The thermal activation energy was also measured to be 0.40 eV. Furthermore, a phosphor-converted LED (pc-LED) coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was fabricated, which exhibited bright orange emission under a forward bias, from 200 to 300 mA. The color rendering index (CRI) of pc-LED coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was higher than the CRI of pc-LED coated with commercial red phosphor, due to the broad emission band of Rb 2CaP 2O 7:Eu 2+ phosphor. In applying with three-band pc-LEDs, moreover, white pc-LED using Rb 2CaP 2O 7:Eu 2+ phosphor had a higher CRI, than using commercial phosphor. These results indicated that Rb 2CaP 2O 7:Eu 2+ phosphor could be a good candidate for a near-UV based w-LED.
| Original language | English |
|---|---|
| Pages (from-to) | 4522-4526 |
| Number of pages | 5 |
| Journal | Materials Research Bulletin |
| Volume | 47 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2012 Dec 1 |
| Externally published | Yes |
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Keywords
- A. Inorganic compounds
- A. Optical materials
- D. Luminescence
- D. Optical properties
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Luminescent properties of phosphor converted LED using an orange-emitting Rb 2CaP 2O 7 : Eu 2+ phosphor. / Song, Hee Jo; Yim, Dong Kyun; Cho, In Sun; Roh, Hee Suk; Kim, Ju Seong; Kim, Dong-Wan; Hong, Kug Sun.
In: Materials Research Bulletin, Vol. 47, No. 12, 01.12.2012, p. 4522-4526.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Luminescent properties of phosphor converted LED using an orange-emitting Rb 2CaP 2O 7
T2 - Eu 2+ phosphor
AU - Song, Hee Jo
AU - Yim, Dong Kyun
AU - Cho, In Sun
AU - Roh, Hee Suk
AU - Kim, Ju Seong
AU - Kim, Dong-Wan
AU - Hong, Kug Sun
PY - 2012/12/1
Y1 - 2012/12/1
N2 - A series of orange-emitting Rb 2CaP 2O 7:Eu 2+ phosphors were synthesized by a conventional solid-state reaction method. The as-prepared phosphors were characterized by X-ray powder diffraction (XRD), fluorescence spectroscopy, and spectroradiometry. XRD showed that all prepared samples exhibited a monoclinic Rb 2CaP 2O 7 phase. Fluorescence spectroscopy showed that the photoluminescence efficiency of Rb 2Ca 1-xP 2O 7:Eu x 2+ phosphors increased with increasing Eu 2+ concentration until x = 0.006, then decreased at higher concentrations, due to a concentration quenching effect. The thermal activation energy was also measured to be 0.40 eV. Furthermore, a phosphor-converted LED (pc-LED) coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was fabricated, which exhibited bright orange emission under a forward bias, from 200 to 300 mA. The color rendering index (CRI) of pc-LED coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was higher than the CRI of pc-LED coated with commercial red phosphor, due to the broad emission band of Rb 2CaP 2O 7:Eu 2+ phosphor. In applying with three-band pc-LEDs, moreover, white pc-LED using Rb 2CaP 2O 7:Eu 2+ phosphor had a higher CRI, than using commercial phosphor. These results indicated that Rb 2CaP 2O 7:Eu 2+ phosphor could be a good candidate for a near-UV based w-LED.
AB - A series of orange-emitting Rb 2CaP 2O 7:Eu 2+ phosphors were synthesized by a conventional solid-state reaction method. The as-prepared phosphors were characterized by X-ray powder diffraction (XRD), fluorescence spectroscopy, and spectroradiometry. XRD showed that all prepared samples exhibited a monoclinic Rb 2CaP 2O 7 phase. Fluorescence spectroscopy showed that the photoluminescence efficiency of Rb 2Ca 1-xP 2O 7:Eu x 2+ phosphors increased with increasing Eu 2+ concentration until x = 0.006, then decreased at higher concentrations, due to a concentration quenching effect. The thermal activation energy was also measured to be 0.40 eV. Furthermore, a phosphor-converted LED (pc-LED) coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was fabricated, which exhibited bright orange emission under a forward bias, from 200 to 300 mA. The color rendering index (CRI) of pc-LED coated with Rb 2Ca 0.994P 2O 7:Eu 0.006 2+ was higher than the CRI of pc-LED coated with commercial red phosphor, due to the broad emission band of Rb 2CaP 2O 7:Eu 2+ phosphor. In applying with three-band pc-LEDs, moreover, white pc-LED using Rb 2CaP 2O 7:Eu 2+ phosphor had a higher CRI, than using commercial phosphor. These results indicated that Rb 2CaP 2O 7:Eu 2+ phosphor could be a good candidate for a near-UV based w-LED.
KW - A. Inorganic compounds
KW - A. Optical materials
KW - D. Luminescence
KW - D. Optical properties
UR - http://www.scopus.com/inward/record.url?scp=84868209606&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84868209606&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2012.09.032
DO - 10.1016/j.materresbull.2012.09.032
M3 - Article
AN - SCOPUS:84868209606
VL - 47
SP - 4522
EP - 4526
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
IS - 12
ER -