Benzothiadiazole‐Based Green Hybridized Local and Charge‐Transfer (HLCT) Fluorophores as Solution‐Processed Non‐Doped Emitters for Simple Structured Electroluminescent Devices. Issue 12 (13th October 2022)

• Record Type: Journal Article
• Authors: Kongsabay, Suwapat; Loythaworn, Thidarat; Petdee, Sujinda; Chasing, Pongsakorn; Funchien, Patteera; Waengdongbung, Wijitra; Wongkaew, Praweena; Sudyodsuk, Taweesak; Promarak, Vinich
• Is Part Of: ChemPhotoChem. Volume 6:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-13
• Subjects: benzothiadiazole -- carbazole -- charge transfer -- organic light-emitting diodes -- solution processable; Photochemistry -- Periodicals; Periodicals; Electronic journals; 541.35
• DOI: 10.1002/cptc.202200154
• Languages: English
• ISSNs: 2367-0932

Abstract

Abstract: Herein, two new solution‐processable HLCT fluorophores (CBzF and CBzFC ) based on benzothiadiazole (Bz) derivatives were designed and synthesized (HLCT=hybridized local and charge transfer). Their optical and photophysical properties were experimentally and theoretically studied and verified by the solvatochromic effect and density functional theory calculations. The two molecules demonstrate high solubility, HLCT features, and an intense green fluorescence with solid‐state photoluminescence quantum yields of 63–72 %. Both fluorophores are effectively applied as non‐doped emitters for solution‐processed double‐layered OLEDs, which produce intense green emission colors with low turn‐on voltages (3.0–3.2 V). Specifically, the CBzFC ‐based solution‐processed device achieves a high maximum luminescence (24400 cd m −2 ), high maximum efficiencies (EQEmax =5.59 %, CEmax =12.24 cd A −1, and PEmax =10.54 lm W −1 ), and decent efficiency low‐off. Abstract : Benzothiadiazole‐based green HLCT fluorophores are synthesized and effectively utilized as non‐doped emitters in solution‐processed double‐layered OLEDs. The devices exhibit low turn‐on voltages (3.0–3.2 V), high luminescence (24400 cd m −2 ) and high efficiencies (EQEmax =of 5.59 %, PEmax =12.24 lm W −1, and CEmax =10.54 cd A −1 ).