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Polymer based blue electrophosphorescent light emitting devices
이창렬,Rupasree Ragini Das,김장주 한국물리학회 2005 Current Applied Physics Vol.5 No.4
A series of bis-orthometalated monocyano Ir(III) complexes, [Ir(ppy)2PX3CN], (X¼ Oph, Ph and n-bu) were synthesized and theinuence of the steric and electronic eects of the phosphine ligand on the photophysical and electrochemical properties of com-plexes were studied. These cyano phosphine complexes emit light from an admixture of triplet metal-to-ligand charge-transfer(3MLCT) and ligand centered (LC) states in the region of 455498 nm with a vibronic progression. The trends of the photophysicaland electrochemical properties of metal complexes in the series were well understood by the electronic parameter of the phosphineligands. Polymer light emitting devices were fabricated by doping Ir(ppy)2P(n-bu)3CN in the PVK host and the device performanceswere investigated. The maximum external quantum eciencyðgexÞwas 1.45% for a 10wt% Ir(ppy)2P(n-bu)3CN doped PVK device.A power eciency of 0.99 lm/W at 230 cd/m2 and 6 mA/cm2 was obtained. The corresponding chloro complexes of the generalformula [Ir(ppy)2PX3Cl] were also synthesized and the optical and device properties were compared with the cyano complexes..
Analysis of Empathy in Physical Therapy Students
이창렬,박민 국제물리치료연구학회 2018 Journal of International Academy of Physical Ther Vol.9 No.4
The purpose of this study was to measure empathy in physical therapy students using a self-report measure of empathy. One hundred seventy students from three different majors participated in the study. The physical therapy group consisted of 49 people, 24 men and 25 women. The psychotherapy group has 59 people, 17 males and 42 females. 62 participants were randomly assigned to the engineering group, with 18 males and 44 females. It was hypothesized that empathy would be higher in physical therapy students compared to those in engineering. Empathy Quotient (EQ) supported the research hypothesis, with students in physical theapy higher than students in engineering There is no statistically significant difference in the EQ between physical therapy and psychotherapy. There were also differences in empathy according to major and gender. Our research suggests that empathy needs to be promoted through education and training.
이창렬 한국진공학회 2015 Applied Science and Convergence Technology Vol.24 No.6
In this work, the electrical bistability of an organic CT complex is demonstrated and the possible switching mechanism is proposed. 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) and tetracyanoquinodimethane (TCNQ) are used as an organic donor and acceptor, respectively, and poly-methamethylacrylate (PMMA) is used as a polymeric matrix for spin-coating. A device with the Al/(Al2O3)/PMMA:BCP:TCNQ[1:1:0.5 wt%]/Al configuration demonstrated bistable and switching characteristics similar to Ovshinsky switching with a low threshold voltage and a high ON/OFF ratio. An analysis of the current-voltage curves of the device suggested that electrical switching took place due to the charge transfer mechanism.