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| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-219 |
| Subject |
Photo-degradation mechanism of the iridium complex FIrpic in various OLED host materials |
| Authors |
Sohyeon Bae, JUNG BAE SON, Seong Keun Kim*
Division of Chemistry, Seoul National University, Korea
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| Abstract |
Extended operation of organic light-emitting diodes (OLEDs) results in materials degradation, which gives the most frequently used blue iridium complex its short lifetime. To investigate the degradation mechanism of the blue iridium complex FIrpic, we used photo-induced degradation to mimic the operational damage of OLEDs. We observed a loss of photoluminescence after light irradiation and found that the intensity loss was dependent on the types of host molecules surrounding FIrpic. We also measured the activation energy from the triplet metal to ligand charge transfer state (3MLCT) to the triplet metal-centered state (3MC) of FIrpic in various kinds of host materials. The activation energy was shown to correlate with the photo-stability of FIrpic in different host materials. We suggest that the transition to 3MC is the main culprit for the degradation of the FIrpic and blue OLED devices.
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| E-mail |
shsh6627@hotmail.com |
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121st General Meeting of the KCS