研究目的
To investigate the effect of organic host on the platinum dopant in solution-processed OLEDs and to achieve high external quantum efficiencies.
研究成果
The study demonstrated high-efficiency solution-processed OLEDs using tetradentate Pt(II) emitters and bipolar organic hosts, with tetra-Pt-S3 showing the best performance. A maximum EQE of 22.4% was achieved, with minimal efficiency roll-off at high luminance. The results suggest that the molecular structure of the emitter and the choice of host material significantly impact device performance.
研究不足
The study is limited by the lower PLQY of some emitters in thin films, the efficiency roll-off at high luminance, and the higher driving voltage in some host materials.
1：Experimental Design and Method Selection:
The study involved the synthesis of two new tetradentate Pt(II) emitters, tetra-Pt-S2 and tetra-Pt-S3, and their comparison with existing emitters tetra-Pt-N and tetra-Pt-S1 in solution-processed OLEDs. Three bipolar organic hosts (m-TPAPy, o-TPAPy, and o-CzPy) were used to fabricate the OLEDs.
2：Sample Selection and Data Sources:
The emitters were synthesized via Grignard reactions and subsequent cyclization in acid, followed by metalation with K2PtCl
3：The hosts were selected based on their bipolar transporting properties. List of Experimental Equipment and Materials:
Instruments included nuclear magnetic resonance spectroscopy, mass spectrometry, elemental analyses, cyclic voltammetry, absorption and emission measurements, and nanosecond time-resolved absorption and emission measurements.
4：Experimental Procedures and Operational Workflow:
The OLEDs were fabricated with an architecture of ITO/PEDOT:PSS/Pt-emitter:host/TmPyPb/TPBi/LiF/Al. The dopant concentration was varied to optimize performance.
5：Data Analysis Methods:
The photo-physical properties were analyzed using UV-vis absorption and emission spectra, and the device performance was characterized by EL spectra, luminance, and CIE coordination measurements.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
