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Updated: Sep 2, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Accurate Wavelength Tracking by Exciton Spin Mixing.

Anton Kirch¹, Toni Bärschneider¹, Tim Achenbach¹

¹Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Nöthnitzer Straße 61, 01187, Dresden, Germany.

Advanced Materials (Deerfield Beach, Fla.)

|August 4, 2022

Summary

This summary is machine-generated.

This study introduces a novel, lightweight wavelength sensor using room-temperature phosphorescence. The device converts light wavelength into measurable time signals with high resolution, offering a compact alternative to bulky spectrometers.

Keywords:

colloidal quantum dots dual-state Förster resonance energy transfer organic room-temperature phosphorescence organic wavelength sensors transient photocurrent

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Area of Science:

Optoelectronics
Materials Science
Spectroscopy

Background:

Traditional wavelength-discriminating systems are bulky and complex, limiting applications requiring portable or integrated solutions.
There is a growing need for lightweight, flexible, and easy-to-process single-pixel devices for simple wavelength measurements.

Purpose of the Study:

To develop a novel, compact wavelength sensor based on room-temperature phosphorescence.
To demonstrate a new method for converting wavelength information into the time domain.

Main Methods:

A solution-processed host-guest system comprising organic room-temperature phosphors and colloidal quantum dots was utilized.
The device leverages the wavelength-dependent population of excited triplet states to modulate phosphorescence afterglow intensity.

Main Results:

The developed device achieves a wavelength resolution of 1 nm and below.
The system successfully transforms wavelength information into the time domain.
An all-organic thin-film wavelength sensor was fabricated and tested.

Conclusions:

The proposed room-temperature phosphorescence-based device offers a promising, compact alternative to conventional spectrometers for specific wavelength measurement tasks.
The novel measurement concept was successfully applied in two distinct applications, showcasing its practical utility.