The Role of Balancing Carrier Transport in Realizing an Efficient Orange-Red Thermally Activated Delayed-Fluorescence Organic Light-Emitting Diode

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

9 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)53120–53128
Journal / PublicationACS Applied Materials and Interfaces
Volume14
Issue number47
Online published15 Nov 2022
Publication statusPublished - 30 Nov 2022

Abstract

Simultaneously realizing improved carrier mobility and good photoluminescence (PL) efficiency in red thermally activated delayed-fluorescence (TADF) emitters remains challenging but important. Herein, two isomeric orange-red TADF emitters, oPDM and pPDM, with the same basic donor-acceptor backbone but a pyrimidine (Pm) attachment at different positions are designed and synthesized. The two emitters show similarly good PL properties, including narrow singlet-triplet energy offsets (0.11 and 0.15 eV) and high photoluminescence quantum yields (ca. 100 and 88%) in doped films. An orange-red organic light-emitting diode (OLED) employing oPDM as an emitter achieves an almost twice as high maximum external quantum efficiency (28.2%) compared with that of a pPDM-based OLED. More balanced carrier-transporting properties are responsible for their contrasting device performances, and the position effect of the Pm substituent leads to significantly distinct molecular packing behaviors in the aggregate states and different carrier mobilities.

Research Area(s)

  • carrier balance, carrier mobility, orange-red emission, organic light-emitting diodes, thermally activated delayed fluorescence

Citation Format(s)

The Role of Balancing Carrier Transport in Realizing an Efficient Orange-Red Thermally Activated Delayed-Fluorescence Organic Light-Emitting Diode. / Tan, Ji-Hua; Jin, Jia-Ming; Chen, Wen-Cheng et al.
In: ACS Applied Materials and Interfaces, Vol. 14, No. 47, 30.11.2022, p. 53120–53128.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review