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RISS 인기검색어
- 검색키워드
- 저자 : Ramchandra Balaji Pode (검색결과 3 건)
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여승준,Ramchandra Balaji Pode,김화민,안정선 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
In the present paper, results on the polymerization of C60 in benzene-ethanol mixtures are reported. The photoluminescence (PL) of the C60 aggregates prepared by using two different methods was investigated using PL spectroscopy. In the case of benzene-ethanol mixtures of different compositions with ethanol volume fractions less than 50% in the solvent mixture, the PL spectra showed the spectral shape of aggregates at 120 K. The change in the spectral shape of the PL emission due to the formation of C60 aggregates at the liquid-solid transition temperature of the solvent mixture as in case of a single solvent (benzene, toluene, or CS2) is reported. A shift in 0-0 transition energy to a high-energy compared with the C60 crystal was noticed. The 0-0 transition energy for a high ethanol volume fraction (>70%) of the solvent mixture showed no shift and was located at almost the same region as that of the C60 crystal PL spectrum. A significantly big size of C60 aggregates in a mixture of benzene-ethanol with a high ethanol volume fraction compared to that of C60 aggregates in a single solvent (>2.3 nm in benzene) is reported. Furthermore, the high-resolution transmission electron microscopy (HRTEM) image of a C60 cluster produced by irradiating C60 aggregates with on UV pulse-laser reconfirmed these results.
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Optical Properties of EuxRe(1−x)(TTA)3Phen Organic Complexes in Different Solvents
N. Thejo Kalyani,S. J. Dhoble,안정선,Ramchandra Balaji Pode 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
Optical absorption spectra of Eu(TTA)3Phen (TTA: Thenoyl Trifluro Acetone) and EuxRe(1−x)(TTA)3Phen (where Re = Y, Tb) organic luminescent complexes in different organic solvents are measured to study the shift of the π → π* and the n → π* optical transitions due to Eu3+ion and β-diketonate moieties. All complexes show good solubility in different basic and acidic solvents. Two optical absorption peaks observed in the UV region of the spectra of solvated complexes shift when the solvent is changed. With a variation in the solvent from basic to acidic, staggering differences in optical absorptions are noticed. Absorption peaks shift bathochromically by a few nm as the solvent varies from basic to acidic. The optical energy band gaps of EuxRe(1−x)(TTA)3Phen are very similar for all the solvents used. A substantial dependence of the electronic absorption spectra of Eu complexes on the solvent is reported.
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Stable Efficiency Roll-off in Solution-processed Phosphorescent Green Organic Light-emitting Diodes
Jung Joo Park,Seong Taek Lee,Tae Jin Park,Woo Sik Jeon,장진,Ramchandra Balaji Pode,권장혁 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
Using a mixed host system of hole transport, 4,4’,4”-tris(N-carbazolyl)triphenylamine (TCTA), and electron transport, 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBI), materials, we report stable efficiency roll-off in solution-processed phosphorescent green organic light-emitting diodes. Maximum current and power efficiencies of 28.2 cd/A and 13.2 lm/W, respectively, were achieved. The current efficiency was over 90% of the maximum value at a luminance of 20,000 cd/m2 in this device, which is very high compared to values reported earlier for any solution-processed triplet devices.
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