2026-09-19T01:53:49Zhttps://wakespace.lib.wfu.edu/server/oai/request

oai:null:10339/907012026-09-02T14:59:26Zcom_10339_14934col_10339_38132

Xu, Junwei 2018-05-24T08:36:00Z 2019-05-23T08:30:12Z 2018 https://wakespace.lib.wfu.edu/handle/10339/90701 Charge balance in organic light emitting structures is essential to simultaneously achieving high brightness and high efficiency. In DC-driven OLEDs, this is relatively straight forward. However, in the newly emerging, capacitive, field-activated AC-driven organic devices, charge balance can be a challenge. We introduced the concept of gating the compensation charge in AC-driven organic devices and demonstrated that this can result in exceptional increases in device performance. To do this we replaced the insulator layer in a typical field-activated organic light emitting device with a nanostructured, wide band gap semiconductor layer. This layer acts as a gate between the emitter layer and the voltage contact. Time resolved device characterization shows that, at high-frequencies (over 40,000Hz), the semiconductor layer allows for charge accumulation in the forward bias, light generating part of the AC cycle and charge compensation in the negative, quiescent part of the AC cycle. en Wake Forest University charge carriers exciton kinetics light emitting devices pervoskite materials semiconductor thin films Charges and Excitons in Organic and Pervoskite Light Emitting Materials and Devices Dissertation Carroll, David L. Williams, Richard T. Üçer, K. Burak Geyer, Scott M. Gulthold, Martin Physics 2019-05-23 open.access