研究目的
To resolve the low quantum efficiency issue of fluorescent OLEDs by efficient singlet exciton harvesting of the fluorescent emitters using the cascade singlet harvesting (CSH) mechanism.
研究成果
The CSH mechanism significantly enhances the EQE of fluorescent OLEDs by efficiently harvesting singlet excitons of the fluorescent emitter through F?rster energy transfer, achieving a high EQE of 19.9%. This approach opens a new way of improving the EQE and achieving 100% IQE in fluorescent OLEDs.
研究不足
The study focused on the CSH mechanism's application in fluorescent OLEDs, with specific materials and conditions. The universality of the device was confirmed by replacing CDBP with mCBP, but further exploration with other materials and conditions could be beneficial.
1：Experimental Design and Method Selection:
The CSH mechanism was realized by doping a fluorescent emitter in the singlet exciton harvesting matrix consisting of high energy exciplex and low energy exciplex. Both exciplexes were thermally activated delayed fluorescence type exciplexes to effectively harvest singlet excitons by reverse intersystem crossing process.
2：Sample Selection and Data Sources:
The exciplex was a mixture of CDBP, POT2T, and DABNA-1, described as a high energy exciplex and a low energy exciplex. The fluorescent emitter was a yellow-emitting TBRb.
3：List of Experimental Equipment and Materials:
Materials included CDBP, POT2T, DABNA-1, and TBRb. Equipment details were not specified.
4：Experimental Procedures and Operational Workflow:
The CSH mechanism was analyzed through transient PL decay measurements, PLQY measurements, and MD simulation to understand the energy transfer and emission processes.
5：Data Analysis Methods:
The F?rster energy transfer rate and Dexter energy transfer rate were calculated based on transient PL decay data. The PLQY of the exciplexes and TBRb doped exciplexes was measured to understand the efficiency of energy transfer.
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
