http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A. Dulda,M. K. Jung,박우정,마사키타카키,윤대호 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
Blue emitting Eu2+ doped barium-magnesium aluminate (BAM) nano-phosphors were synthesized using liquid phase precursor (LPP) method corresponding to Ba0.87-0.90Mg0.91-1.0Al10O17-17.05: Eu0.05. The phosphor particle size, morphology and crystallinity were characterized by FESEM and X-Ray diffraction analysis. The effects of composition and particle size on the luminescence efficiency were investigated by employing photoluminescence spectroscopy. The rod shaped phosphor particles ~60 nm in diameter and 400-700 nm in length were obtained. The phosphor particles emission peaks shifted towards a longer wavelength with 80% luminescence intensity compared with the commercial BAM.
Photoluminescence and morphology of flux grown BAM phosphor using a novel synthesis method
A. Dulda,조덕수,W. J. Park,마사키타카키,윤대호 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
Small Eu2+ doped barium magnesium aluminate (BAM : Eu) phosphor particles with a narrow size distribution were prepared using a flux-assisted liquid phase precursor (LPP) method. XRD showed that the crystallinity of BAM particles increased significantly with an increase in the boric acid concentration, as a flux, and the firing temperature. According to FESEM, the phosphor particles produced without the flux and fired at 1450℃ had a rod type morphology, 60-100 nm in diameter and 500- 700 nm in length. The morphology of the phosphor particles transformed from a rod to a hexagonal type with a concomitant increase in the particle size (from ~1 to 2 μm) when 1, 2 and 5 wt% of boric acid was added. The photoluminescence intensity of phosphor particles was also influenced by the addition of the flux due to the enhanced particle size, crystallinity and activator ion distribution.
Y.H. Song,T.Y. Choi,마사키타카키,K. Senthil,윤대호 한국물리학회 2012 Current Applied Physics Vol.12 No.2
This study reports an approach for enhancing the luminescent properties of Y3Al5O12: Ce3+0.07 using an organic compound precursor. The Y3Al5O12: Ce3=0.07 nano-sized phosphors had a relatively uniform particle size, approximately 50e80 nm, when sintered at 1200 ℃ for 1 h. The photoluminescence results showed the maximum peak intensity when the concentration of Ce3+ ions was 0.07 mol. The results suggest that nano-sized phosphors synthesized from organic compound precursors can be used as alternative efficiency emitting phosphors in the LED applications.
윤대호,M. K. Jung,W. J. Park,J. W. Moon,마사키타카키,A. Dulda 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
(Yx,Gdy)O3:Eu3+1-x-y red phosphor was prepared at ring temperatures from 700 ℃ to 1400 ℃ by using liquid phase precursor methods. The particle sizes of the samples prepared at firing temperatures of 800 ℃ and 1000 ℃ were about 23 nm and 64 nm, respectively. The strongest absorption band of the samples excited at 613 nm was observed at 260 nm, which resulted from transitions toward the charge transfer state (CTS) corresponding to the `Eu3+-O2-, interactions. At intense emission peak was observed at 613 nm due to the electric dipole transition of `5D0-7F2' induced by the lack of inversion symmetry at the Eu3+ sites. We observed that the maximum emission intensity of the samples was about 82.3 % at 1400 ℃.