Abstract
We developed green hyper-fluorescent organic light-emitting diodes (OLEDs) using tetradentate Pt(Ⅱ) complex phosphorescent sensitizer to improve external quantum efficiency (EQE) and reduce efficiency roll-off through suppressed Deter energy transfer to green fluorescent emitter of N9,N9,N10,N10-tetrakis(4-(2-phenylpropan-2-yl)phenyl)anthracene-9,10-diamine (PhtBuPAD). The tetradentate Pt(Ⅱ) complex including bulky blocking unit prevented Dexter energy transferred into green fluorescent emitter. In the device evaluation, the hyper-fluorescent OLED is maintained the high EQE of 21.1% in spite of a high doping concentration of green fluorescent emitter of 3 wt%. As a result, the maximum EQE at optimized doping concentration 2 wt% shows 23.4% and 22.2% at 3000 cd/m2. It induced only 5.0% efficiency roll-off, which is 6.4-fold improvement compared to our previous work.
| Original language | English |
|---|---|
| Pages (from-to) | 1488-1491 |
| Number of pages | 4 |
| Journal | Digest of Technical Papers - SID International Symposium |
| Volume | 53 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2022 |
| Event | 59th International Symposium, Seminar and Exhibition, Display Week 2022 - San Jose, United States Duration: 8 May 2022 → 13 May 2022 |
Keywords
- green fluorescent emitter
- hyper-fluorescence
- tetradentate