Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received April 10, 2006
Accepted October 16, 2006
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.
All issues
Optical characteristics of xSrO·yAl2O3 : Eu phosphors excited by ultraviolet light emitting diodes
School of Chemical Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, Korea 1Department of Chemical Engineering, ChungAng University, 221, Huksuk-dong, Dongjak-gu, Seoul 156-756, Korea
Korean Journal of Chemical Engineering, March 2007, 24(2), 294-298(5), 10.1007/s11814-007-5059-3
Download PDF
Abstract
We investigated the optical characteristics of strontium aluminate phosphors excited by near ultraviolet light emitting diodes (UV LEDs). For UV LEDs applications, strontium aluminates doped with europium were prepared at high temperature in a weakly reductive atmosphere. The effect of boric acid as a flux was considered. The excitation and emission spectra of these phosphors indicated that all of them have a broad band and that the main emission peaks, situated at around 490 nm for 4SrO·7Al2O3 : Eu and 520 nm for SrOAl2O3 : Eu, are both due to the 4f65d1→4f7 transition of Eu2+. The typical brightness of a phosphor-converted LED, which was made with synthesized phosphors and a blue LED, was 712 mcd. By using the synthesized phosphors, phosphor-converted white LEDs could be well fabricated with good optical characteristics. In this case, color coordinates could be controlled from x=0.1373 and y=0.4635 to x=0.2386 and y=0.6066 at 20 mA and 3.69 V.
Keywords
References
Steigerwald DA, Bhat JC, Collins D, Fletcher RM, Holcomb MO, Ludowize MJ, IEEE J. Selected Topics in Quantum Electronics, 8(2), 311 (2002)
Mueller-Mach R, Mueller GO, Krames MR, Trottier T, IEEE J. Selected Topics in Quantum Electronics, 8(2), 339 (2002)
http://www.nichia.co.kr
Taguchi T, Proceeding of EL2002, 264 (2002)
Park IW, Yoo WT, Yoo JS, Choi CK, IDW’02, 1011 (2002)
Akiyama M, Xu C, Lin Y, Nonaka K, Watanabe T, J. Lumines., 97, 13 (2002)
Abbruscato V, J. Electrochem. Soc., 118(6), 930 (1971)
Smets B, Rutten J, Hoeks G, J. Electrochem. Soc., 136(7), 2119 (1989)
Lee KM, Cheah KW, An B, Gong M, Liu Y, Proceeding of EL2002 264 (2002)
Lin Y, Tang Z, Zhang Z, Nan C, Appl. Phys. Lett., 81(6), 996 (2002)
Lin Y, Tang Z, Zhang Z, Mater. Lett., 51, 14 (2001)
Minquan W, Wang D, Guanglie L, Mater. Sci. Eng. B-Solid State Mater. Adv. Technol., 57, 18 (1998)
Cho SH, Kwon SH, Yoo JS, Oh CW, Lee JD, Hong KJ, Kwon SJ, J. Electrochem. Soc., 147(8), 3143 (2000)
Ito S, Banno S, Suzuki K, Physick Z, Chem. Neue. Folge., 105, 173 (1977)
Mueller-Mach R, Mueller GO, Krames MR, Trottier T, IEEE J. Selected Topics in Quantum Electronics, 8(2), 339 (2002)
http://www.nichia.co.kr
Taguchi T, Proceeding of EL2002, 264 (2002)
Park IW, Yoo WT, Yoo JS, Choi CK, IDW’02, 1011 (2002)
Akiyama M, Xu C, Lin Y, Nonaka K, Watanabe T, J. Lumines., 97, 13 (2002)
Abbruscato V, J. Electrochem. Soc., 118(6), 930 (1971)
Smets B, Rutten J, Hoeks G, J. Electrochem. Soc., 136(7), 2119 (1989)
Lee KM, Cheah KW, An B, Gong M, Liu Y, Proceeding of EL2002 264 (2002)
Lin Y, Tang Z, Zhang Z, Nan C, Appl. Phys. Lett., 81(6), 996 (2002)
Lin Y, Tang Z, Zhang Z, Mater. Lett., 51, 14 (2001)
Minquan W, Wang D, Guanglie L, Mater. Sci. Eng. B-Solid State Mater. Adv. Technol., 57, 18 (1998)
Cho SH, Kwon SH, Yoo JS, Oh CW, Lee JD, Hong KJ, Kwon SJ, J. Electrochem. Soc., 147(8), 3143 (2000)
Ito S, Banno S, Suzuki K, Physick Z, Chem. Neue. Folge., 105, 173 (1977)
