2015年3月
Highly efficient blue electroluminescence based on thermally activated delayed fluorescence
NATURE MATERIALS
- 巻
- 14
- 号
- 3
- 開始ページ
- 330
- 終了ページ
- 336
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/NMAT4154
- 出版者・発行元
- NATURE PUBLISHING GROUP
Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100%.
- リンク情報
- ID情報
-
- DOI : 10.1038/NMAT4154
- ISSN : 1476-1122
- eISSN : 1476-4660
- Web of Science ID : WOS:000350136400022