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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18 2019 Apr. Farewell Dinner for Dr. Shin and Dr. Cho file 지미버틀러 2019.04.11 52
» Photo-chemistry and -physics of Ir complexes (190410 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 27
16 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 14
15 Surface and Interfacial Chemistry of Bio-inspired Phenolic Coatings (190213 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.11 12
14 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 9
13 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 10
12 2018 Sep. Farewell Lunch for Dr. Kim file 지미버틀러 2019.04.10 18
11 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 12
10 2018 July Farewell Dinner for Prof. Kim and Prof. Lee file 지미버틀러 2019.04.10 15
9 2018 May Happy Hour file 지미버틀러 2019.04.10 13
8 Simulation studies on dynamical and structural properties of liquid state materials: From the perspective of statistical mechanics (180612 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.10 10
7 Antimony selenide (Sb2Se3) photocathode for photoelectrochemical water splitting (180409 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.10 7
6 Designing (photo)electrocatalysts with consideration of its application to real device for hydrogen economy and artificial photosynthesis (180227 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.10 10
5 An Overview of R&D Activities around NST, KISTI and NERSC (171213 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.04.10 8
4 Controlled self-assembly of block copolymer particles from emulsions : Combined study of experiment, theory, and simulation (171016 KSEA Berkeley Chapter Seminar) file 지미버틀러 2019.02.24 129
3 KSEA North West Regional Conference 2013 - Seattle file orppaha 2013.08.14 7585
2 Korea Electrotechnology Research Institute and Berkeley Lab Will Work Together on Smart Grid R&D orppaha 2013.08.07 5372