Direct Operando Identification of Radiative and Non-radiative Transition Pathways in Phosphor-Sensitized Fluorescent Green Organic Light Emitting Diodes
발표자
임성열 (성균관대학교)
연구책임자
조새벽 (성균관대학교)
공동저자
임성열 (성균관대학교), 조새벽 (성균관대학교)
초록
내용
To achieve highly stable organic light-emitting diodes (OLEDs), precise control of non-radiative transition processes involving triplet excitons is essential, particularly the suppression of Dexter energy transfer (DET). Although various molecular design strategies have been proposed to reduce DET-induced energy losses, direct and quantitative understanding of charge and exciton transition pathways under actual device operating conditions remains limited, hindering rational design for improved operational stability. Here, we investigate the dynamics of DET in phosphor-sensitized fluorescent (PSF) green OLEDs using transient absorption spectroscopy (TAS) and transient charge modulation spectroscopy (TCMS). By quantitatively analyzing non-radiative transition pathways related to the origin of instability, we identify the exciton dynamics governing operational instability. Based on these insights, we provide concrete molecular design guidelines for enhancing the stability of PSF-OLEDs.