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Electrochemically triggered upconverted luminescence for light-emitting devices.

Haruki Minami¹, Takuya Ichikawa¹, Kazuki Nakamura¹

¹Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan. koban@faculty.chiba-u.jp.

Chemical Communications (Cambridge, England)

|September 24, 2019

Summary

Electrochemiluminescence was achieved by electrochemically triggering upconverted luminescence via triplet-triplet energy transfer (TTET) and triplet-triplet annihilation upconversion (TTA-UC). This novel approach was demonstrated in a ruthenium(II) tris(bipyridine) and diphenylanthracene electrochemical device.

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Area of Science:

Electrochemistry
Luminescence
Materials Science

Background:

Electrochemiluminescence (ECL) is a sensitive analytical technique.
Upconverted luminescence (UC) allows emission of higher energy photons from lower energy excitation.
Combining ECL with UC offers potential for enhanced analytical performance.

Purpose of the Study:

To investigate electrochemically triggered upconverted luminescence (UC) for the first time.
To explore the mechanisms of triplet-triplet energy transfer (TTET) and triplet-triplet annihilation upconversion (TTA-UC) in an electrochemical system.
To demonstrate the feasibility of a Ru(bpy)32+/DPA-containing electrochemical device for UC-ECL.

Main Methods:

Fabrication of an electrochemical device incorporating ruthenium(II) tris(bipyridine) (Ru(bpy)32+) and diphenylanthracene (DPA).
Electrochemical measurements to drive luminescence emission.
Spectroscopic analysis to confirm TTET and TTA-UC processes.

Main Results:

Observation of electrochemically triggered upconverted luminescence.
Confirmation of TTET and TTA-UC as the underlying mechanisms.
Successful demonstration in a Ru(bpy)32+/DPA electrochemical system.

Conclusions:

Electrochemically triggered UC-ECL is achievable.
TTET and TTA-UC are viable pathways for UC-ECL.
The Ru(bpy)32+/DPA system serves as a proof-of-concept for this novel luminescence phenomenon.