TY - JOUR
T1 - Triarylboron-Based Dual Thermally Activated Delayed Fluorescence Emitter for Single Molecule White Light-Emitting Diodes
AU - Liu, Meiyan
AU - Li, Hongbo
AU - Ma, Hongwei
AU - Yao, Chunxia
AU - Zhao, Fenggui
AU - Han, Shuai
AU - Zhang, Ziqian
AU - Wang, Nan
AU - Yin, Xiaodong
N1 - Publisher Copyright:
© 2025 American Chemical Society.
PY - 2025/4/9
Y1 - 2025/4/9
N2 - Single-molecule emitters with dual thermally activated delayed fluorescence (TADF) characteristics are very promising for application in organic light-emitting diodes (OLEDs). Rarely reported, organic dual-TADF materials, especially mechanochromic materials, are in demand. We present two donor-acceptor emitters, Mes*BA-Ac and FXylBA-Ac, which exhibit dual-TADF in the solid state due to the separation of HOMO and LUMO and strong intermolecular interactions. Their phase transition from amorphous to crystalline under stimuli leads to switchable TADF emissions. By blending Mes*BA-Ac with poly(methyl methacrylate), we achieve pure white light with Commission Internationale de l’Eclairage (CIE) coordinates of (0.33, 0.32). Furthermore, single-molecule white organic light-emitting diodes (SM-WOLEDs) using Mes*BA-Ac have been fabricated, reaching a maximum external quantum efficiency (EQEmax) of 1.65% with CIE coordinates of (0.30, 0.31). More importantly, the dual-TADF emission mechanism enables the devices to maintain stable white-light emission across a relatively wide voltage range, providing valuable insights for the advancement of pure organic SM-WOLEDs.
AB - Single-molecule emitters with dual thermally activated delayed fluorescence (TADF) characteristics are very promising for application in organic light-emitting diodes (OLEDs). Rarely reported, organic dual-TADF materials, especially mechanochromic materials, are in demand. We present two donor-acceptor emitters, Mes*BA-Ac and FXylBA-Ac, which exhibit dual-TADF in the solid state due to the separation of HOMO and LUMO and strong intermolecular interactions. Their phase transition from amorphous to crystalline under stimuli leads to switchable TADF emissions. By blending Mes*BA-Ac with poly(methyl methacrylate), we achieve pure white light with Commission Internationale de l’Eclairage (CIE) coordinates of (0.33, 0.32). Furthermore, single-molecule white organic light-emitting diodes (SM-WOLEDs) using Mes*BA-Ac have been fabricated, reaching a maximum external quantum efficiency (EQEmax) of 1.65% with CIE coordinates of (0.30, 0.31). More importantly, the dual-TADF emission mechanism enables the devices to maintain stable white-light emission across a relatively wide voltage range, providing valuable insights for the advancement of pure organic SM-WOLEDs.
KW - donor−acceptor structure
KW - dual thermally activated delayed fluorescence
KW - mechanochromism
KW - single molecule white light-emitting diodes
KW - triarylboron
UR - http://www.scopus.com/inward/record.url?scp=105002495553&partnerID=8YFLogxK
U2 - 10.1021/acsami.4c20583
DO - 10.1021/acsami.4c20583
M3 - Article
AN - SCOPUS:105002495553
SN - 1944-8244
VL - 17
SP - 21509
EP - 21520
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 14
ER -