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|
| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
MAT.P-409 |
| Subject |
Correlation between emitter orientations and molecular structures in TADF-based OLEDs |
| Authors |
Junho Lee, Chiho Lee, Sungnam Park*
Department of Chemistry, Korea University, Korea
|
| Abstract |
In small molecule organic light-emitting diodes (OLEDs) which are implemented with emitters doped in host materials, the emitters’ orientation is known to be very important for improving the out-coupling efficiency. In comparison with the internal quantum efficiency which has reached almost 100% such as using a thermally activated delayed fluorescence (TADF), a light out-coupling efficiency still has room to be enhanced. To control the orientation of emitter molecules in a host matrix, understanding of the molecular properties of dopant and host molecules and their interactions is required. However, the intrinsic molecular characteristics for horizontal orientation are not well-known especially for host molecules. In this work, we utilized angle-dependent photoluminescence (PL) measurements combined with quantum chemical calculations to investigate the orientations of several dopant molecules doped in different types of host molecules. Our experimental and computational results demonstrated that the linear and planar dopant molecules prefer horizontal orientation in our host materials. Moreover, at a low doping concentration (15±1 wt. %), the strong interactions between host and dopant molecules can lead to the horizontal orientation of dopant molecules. Our donor-acceptor-donor typed hosts with tilted structures are found to interact strongly with dopant molecules due to their localized electron density. Consequently, our current results can provide design strategies for emitting layer molecules to develop highly efficient TADF OLEDs. |
| E-mail |
pplkjh2@naver.com |
|
120th General Meeting of the KCS