Thermally activated delayed phosphorescence and interchromophore exciton coupling in a platinum-based organometallic emitter

Chun Hong Mak, Rugeng Liu, Xu Han, Yunqi Tang, Xingli Zou, Hsin-Hui Shen, Yao Meng, Guizheng Zou, Hsien-Yi Hsu

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

The comprehension of triplet exciton mechanisms in organic–inorganic semiconductors has a significant impact on emerging optoelectronic and biosensing technologies. The capability to mutually integrate the photophysical properties of conjugated organic semiconductor with those of well-characterized heavy metals is therefore of utmost importance. Due to heavy-atom effect, the platinum-based triplet emitter, PPtTPtT, achieves highly efficient phosphorescence. Here, it is first demonstrated that π-conjugated PPtTPtT organometallics in electrochemiluminescence (ECL) devices exhibit precisely dual and blueshifted phosphorescence simultaneously induced by thermally activated delayed phosphorescence (TADP) and interchromophore exciton interaction in H-aggregates. Utilizing a combination of photophysical and electrochemical techniques, the distinctive ECL process involving energy sufficient singlet route (S-route), intersystem crossing, as well as triplet relaxation, hereafter called SIT-route, is reported for the first time. The hybrid TADP materials designed with donor–acceptor–donor system enable potential applications, including but not limited to organic light-emitting diodes, light-emitting electrochemical cells, imaging devices, and other bio-related detections.

Original languageEnglish
Article number2001023
Number of pages9
JournalAdvanced Optical Materials
Volume8
Issue number20
DOIs
Publication statusPublished - 19 Oct 2020

Keywords

  • molecular design
  • organometallic emitters
  • phosphorescent devices, electrochemiluminescence devices
  • thermally activated delayed phosphorescence

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