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Photon Upconversion in a Vapor Deposited 2D Inorganic-Organic Semiconductor Heterostructure.

Reynolds Dziobek-Garrett¹, Christian J Imperiale², Mark W B Wilson²

¹Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States.

|May 16, 2023

Summary

This study demonstrates photon upconversion in van der Waals heterostructures using WSe2 monolayers and DBP-doped rubrene. Efficient energy transfer occurs at low light intensities, paving the way for advanced optoelectronics.

Keywords:

2D material exciton,time-resolved photoluminescence triplet fusion upconversion van der Waals heterostructure

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Area of Science:

Materials Science
Condensed Matter Physics
Organic Electronics

Background:

Van der Waals heterostructures offer tunable interfaces for energy transfer.
Organic semiconductors like rubrene can exhibit triplet fusion for photon upconversion.

Purpose of the Study:

To engineer energy transfer processes in van der Waals heterostructures.
To demonstrate photon upconversion using 2D transition metal dichalcogenides and organic semiconductors.

Main Methods:

Fabrication of WSe2/rubrene heterostructures via vapor deposition.
Time-resolved and steady-state photoluminescence spectroscopy.
Analysis of excitation intensity dependence for mechanism elucidation.

Main Results:

Rapid subnanosecond quenching of WSe2 emission by rubrene.
Observation of fluorescence from DBP molecules at 612 nm, indicating photon upconversion.
Confirmation of triplet fusion mechanism with efficient upconversion at low threshold intensities (110 mW/cm2).

Conclusions:

Successful demonstration of photon upconversion in WSe2/rubrene van der Waals heterostructures.
The study highlights the potential of these materials for advanced optoelectronic applications.
Efficient energy transfer mechanisms in vdWHs can be leveraged for novel functionalities.