| 초록 |
Advances in electroluminescence benefit from the development of emitters capable of harvesting all the electrogenerated excitons. However, the existing exciton-harvest strategy has drawbacks due to quantum chemical disallowance or slow exciton spin conversion. To overcome these limitations, we have proposed a new exciton-harvest strategy which employs exergonic, El-Sayed rule-allowed reverse intersystem crossing (ES-rISC) from the triplet n–π* transition state to the singlet π–π* transition state. Validity of our strategy was examined by a series of blue-fluorescent organic molecules based on 9,10-diphenylanthracene which incorporated carbonyl units to provide triplet n–π* transition state. Mechanistic studies suggested exothermicity of triplet exciton conversion. Electroluminescence studies revealed an exciton-utilization efficiency as large as 46%. We believe that our research will provide insights into the development of high-efficiency electroluminescent molecules. |
