Super-long-lived charges releasable
Trapped charges with lifetimes exceeding 2 hours are observed in doped OLEDs, and alternating positive/negative pulse voltage detraps and recombines them to achieve tenfold light emission enhancement at low temperatures.
Chen, Jing · Zhao, Xi · Wang, Huiyao · Yunxi, Jiang · Tang, Xiantong · Wu, Yuting · Wei, Fuxian · Xiong, Zuhong
Advanced Functional Materials 2023
Trapped charge lifetime exceeds 2 hours (at 20K)
Tenfold light emission enhancement (alternating positive/negative pulse vs. constant voltage drive)
Lifetime governed by charge spacing, not trap energy depth