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백창현,김진형,나수원,최민수,강상욱,손호진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
To evaluate the efficacy of ortho-aryllation in the second coordination sphere of octrahedral iridium complex, a series of homoleptic NHCbased Ir(C^C<sup>R</sup>)<sub>3</sub>-type complexes were desgined and prepared by introducing various substituents (R = H, Me, Ph, MePh, and diMePh) at the ortho-position of the aryl unit of orthometalling phenyl group. In solution, unnoticiable increase of emission quantum yields was observed within the variation of the ortho-substituent of sterically demanding side-branch, a -diMePh group, showing the radiative quantum yield of m-Ir(C^C<sup>diMePh</sup>)<sub>3</sub> (Ф<sub>PL</sub> = 1.9%) being higher than that of the pristine carbene-based m-Ir(C^C<sup>H</sup>)<sub>3</sub> (Ф<sub>PL</sub> = 1.2%).
Influence of bulky substituents on the photophysical properties of homoleptic iridium(III) complexes
백창현,김진형,나수원,이대한,조대원,강상욱,손호진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
A new series of homoleptic cyclometalated iridium(III) complexes based on a phenylpyridine (ppy) ligand containing bulky substituents have been synthesized and characterized. The phosphorescence behavior of the Ir complexes is investigated by steady-state and time-resolved emission spectroscopic techniques. Comparison of the results with those of the reference Ir(ppy)<sub>3</sub> reveals that the emission color and photophysical properties of other Ir complexes are influenced by the electron-donating groups (-CH<sub>3</sub> and phenyl derivatives) attached to the ppy ligand. In particular, systematic red-shifts are observed by increasing the electron-donating ability. The emission spectrum of Ir(Me-ppy)<sub>3</sub>, having a small electron-donating -CH<sub>3</sub> group, is redshifted; however, the emission quantum yield is low and the nonradiative decay constant is large.
백창현,최동호,이부용,이인규 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.6
Interpretation of relevance between long-wave radiation and meteorological elements is recognized as an essential element for understanding the underlying mechanism of urban thermal environment formation. In this study, we analyzed relation between three elements : long-wave radiation, temperature, and lower-middle class cloudiness. The correlation was analyzed through field observations. The results are as follows. ① Temperatures and long-wave radiation increased from January to March. This phenomenon has been confirmed in urban and suburban areas. ② Long-wave radiations showed a tendency to increase clearly with increasing cloudiness.
백창현,나수원,김진형,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We investigated the relation between the narrowing of the emission band and structural changes using synthesised tetradentate Pt-complexes. All Pt-complexes showed phosphorescence with high colour performance and the vibronic structure in the emission spectra was measured at 77 and 300 K. The 0-0 vibronic band was significantly more intense compared to the 0-1 vibronic band, due to the structural restriction of the fused tetradentate ligand. The spacing between the 0-0 and 1-0 vibronic bands were 1487 and ca. 1323 cm-1, respectively, which were compared to the vibration modes in the IR and Raman spectra.