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Updated: Aug 29, 2025

Triplet Fusion Upconversion Nanocapsule Synthesis

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Published on: September 7, 2022

Parallel triplet formation pathways in a singlet fission material.

Nilabja Maity¹, Woojae Kim^2,3, Naitik A Panjwani⁴

¹Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India.

Nature Communications

|September 6, 2022

Summary

This summary is machine-generated.

Organic singlet fission materials can boost solar cell efficiency. Researchers found long-lived triplets form via intersystem crossing, not just singlet fission, with molecular arrangement significantly impacting this process.

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Synthesis and Characterization of Supramolecular Colloids

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Published on: April 22, 2016

Area of Science:

Materials Science
Photochemistry
Organic Electronics

Background:

Singlet fission (SF) in organic materials offers a pathway to enhance photovoltaic efficiencies by generating multiple excitons from a single photon.
While polyacenes are well-studied, the precise mechanisms and characterization of triplet pairs and free triplets produced via SF remain incompletely understood.

Purpose of the Study:

To investigate the formation pathways of long-lived triplet states in supramolecular aggregates of diketopyrrolopyrrole derivatives.
To elucidate the role of correlated triplet pairs (¹(TT)) and intermolecular coupling geometry in singlet fission dynamics.

Main Methods:

Transient absorption spectroscopy
Photoluminescence spectroscopy
Transient electron paramagnetic resonance (EPR)
Fabrication of supramolecular aggregate thin films (J-like and H-like)

Main Results:

Photoexcitation leads to the formation of spin-0 correlated triplet pairs (¹(TT)) from the lower Frenkel exciton state.
¹(TT) existence is confirmed by Herzberg-Teller emission and near-infrared triplet-state photoinduced absorption.
Long-lived triplets are primarily generated through classical intersystem crossing, competing with ¹(TT) dissociation.
¹(TT) formation is dependent on intermolecular coupling geometry, observed only in J-like films.

Conclusions:

The dominant pathway for long-lived triplet generation in these systems is intersystem crossing, not solely ¹(TT) dissociation.
Intermolecular coupling geometry critically influences singlet fission dynamics and the formation of correlated triplet pairs.
Understanding these pathways is crucial for optimizing organic materials for high-efficiency photovoltaics.