LBNL 한인 모임
ABSTRACT: Ir(III) complexes are divided into two classes: (1) homoleptic complexes containing three identical cyclometalating ligands and (2) heteroleptic complexes with two identical cyclometalating  ligands and an ancillary ligand. Two types of geometric isomers (i.e. facial and meridional) are found in homoleptic complexes. Although there are exceptions, it is accepted that facial Ir-complexes have better photophysical properties, including high emission quantum yields and suitable lifetimes, than meridional Ir-complexes. Heteroleptic Ir-complexes have two identical cyclometalating ligands and one ancillary ligand. Based on the geometry of the cyclometalating ligands, heteroleptic complexes can also be classified as one of two isomers (i.e. cis or trans). To prepare highly phosphorescent Ir-complexes, which are essential for practical applications in OLEDs and APS, nonradiative processes should be suppressed. An electron can be populated in the antibonding MC state by an electronic d-d transition or by crossing from a phosphorescent state. The activation energies for the crossing from 3 MLCT to non-radiative decay ( 3 MC and/or vibronic relaxation) were estimated from the temperature dependencies of the emission lifetime and theatrical calculation. The experimental results were in line with the theoretical calculations based on integrating quantum chemical modeling methods. The experimental and theatrical investigation is well determined by steady-state spectroscopy, time-resolved spectroscopy, and Gaussian 09 study.

BIO: Dr. Yang-Jin Cho is a PostDoc working with Prof. T. Don Tilley in Chemical Sciences Division of LBNL, and affiliated with department of chemistry, UC Berkeley. He received Ph.D. and B.S. in Chemistry at Korea University, Korea. He is now working on synthesis and investigation of Co-cubane as O2 evolution catalyst.IMG_7242_A.JPG
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31 Unveiling the mechanism of phase evolution and H2 storage/CO2 uptake properties in nanohybride of magnesium borohydride supported by reduced graphene oxide (200124 KSEA Berkeley Chapter Seminar) file 지미버틀러 2020.01.30 459
30 Operando X-ray absorption spectroscopy studies on CO electroreduction reaction (200124 KSEA Berkeley Chapter Seminar) file 지미버틀러 2020.01.30 425
29 3D printed absorber for capturing toxic chemotherapy drugs before they spread through the body (191101 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.11.09 528
28 2019 Oct. KSEA Berkeley Chapter Happy Hour file 지미버틀러 2019.10.12 1170
27 Aligned carbon nanotube architectures for biomimetic metasurfaces (190807 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.08.08 777
26 High Throughput Evolution of Near Infrared Serotonin Nanosensors (190807 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.08.08 902
25 The solid/gas and solid/liquid interface in the catalyst probed with Ambient-pressure X-ray Photoelectron Spectroscopy (190807 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.08.08 424
24 In-situ Liquid-Phase Transmission Electron Microscopy for Studying Nanocrystal Formation (190605 KSEA Berkeley Seminar) file 지미버틀러 2019.06.05 1221
23 한국산업기술평가관리원 사업설명회 (190605 KSEA Berkeley Seminar) file 지미버틀러 2019.06.05 1957
22 Solid state Li batteries. What is it? and where is it going? (190605 KSEA Berkeley Seminar) file 지미버틀러 2019.06.05 1240
21 2019 Apr. Farewell Dinner for Dr. Shin and Dr. Cho file 지미버틀러 2019.04.11 818
» Photo-chemistry and -physics of Ir complexes (190410 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 835
19 A single-ion conducting borate network polymer as a viable electrolyte for Li-metal batteries (190410 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 669
18 Surface and Interfacial Chemistry of Bio-inspired Phenolic Coatings (190213 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 629
17 Study on the chemical/electronic structures of organic functional materials by combining photoemission spectroscopy with argon gas cluster ion beam sputtering (181214 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 681
16 High Symmetry Ordered Multigrain Nanocrystals to Reveal and Maximize the Effect of Grain Boundary Defects (181018 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 721
15 2018 Sep. Farewell Lunch for Dr. Kim file 지미버틀러 2019.04.10 812
14 Development of Innovative materials and process technology: 1. Microreactors for Better Chemical Processes 2. Peptide Self-Assembly (180813 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.10 615
13 2018 July Farewell Dinner for Prof. Kim and Prof. Lee file 지미버틀러 2019.04.10 681
12 2018 May Happy Hour file 지미버틀러 2019.04.10 637