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Thermally Activated Delayed Photoluminescence Based on Functionalized Quantum Dots.

Shan He^1,2, Guijie Liang³, Ben Zhong Tang²

¹State Key Laboratory of Chemical Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, China.

Angewandte Chemie (International Ed. in English)

|October 17, 2025

Summary

Colloidal quantum dots (QDs) functionalized with organic molecules can prolong exciton lifetimes to sub-milliseconds. This enables thermally activated delayed photoluminescence (TADPL) for advanced light-harvesting applications.

Keywords:

Quantum dots Thermally activated delayed photoluminescence Time‐resolved spectroscopy Triplet energy transfer Triplet photochemistry

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Area of Science:

Materials Science
Photochemistry
Quantum Chemistry

Background:

Colloidal quantum dots (QDs) are excellent light-harvesting materials with tunable optical properties.
Short exciton lifetimes (nanoseconds) in QDs limit their efficiency and applications.
Hybrid QD-organic molecule structures offer a new platform for manipulating exciton dynamics.

Purpose of the Study:

To review principles for constructing efficient thermally activated delayed photoluminescence (TADPL) systems using QD-organic hybrids.
To identify strategies for regulating TADPL lifetimes.
To highlight advantages of TADPL over TADF molecules and review applications.

Main Methods:

Surface functionalization of QDs with organic molecules.
Utilizing rapid triplet energy transfer (TET) and reverse TET (rTET) for exciton manipulation.
Analysis of photoluminescence properties and lifetime measurements.

Main Results:

TADPL systems achieve prolonged exciton lifetimes (sub-milliseconds) via QD-molecule triplet interactions.
Strategies for facile regulation of TADPL lifetimes are identified.
TADPL offers benefits like smaller Stokes shifts and narrower emission linewidths compared to TADF.

Conclusions:

QD-organic hybrid structures provide a versatile platform for achieving long exciton lifetimes and TADPL.
TADPL systems show promise for applications in triplet-triplet annihilation up-conversion and photochemistry.
Further research is needed to address current limitations and explore future directions.