Issue 22, 2019

Almost complete radiationless energy transfer from excited triplet state of a dim phosphor to a covalently linked adjacent fluorescent dye in purely organic tandem luminophores doped into PVA matrix

Abstract

In solid PVA matrix some thiophene- and selenophene-comprising heteroaromatic compounds reveal moderate room temperature phosphorescence with emission peaks between 550 and 600 nm and possessing lifetime in millisecond range upon excitation with near-UV radiation. In tandem luminophores almost complete intramolecular interchromophore energy transfer takes place by FRET mechanism from the named phosphors in excited triplet state to adjacent covalently linked fluorescent dyes, leading to emission of light from the fluorophore. Variation of length of the linker connecting the chromophores enables tuning of luminescence lifetime in the range from 5 ms to 100 μs. The delayed emission spectrum of the tandem luminophores originates from the acceptor fluorophore. Triplet–singlet energy transfer outperforms other relaxation pathways of the excited triplet state even at 75 °C, making the luminescence lifetime temperature independent. Thus a universal strategy is provided for converting inherently dim organic phosphors into bright long-lifetime luminescence emitters. This discovery may open new avenues for construction of efficient purely organic light emitting devices and photoluminescent sensors for measurement of various analytes.

Graphical abstract: Almost complete radiationless energy transfer from excited triplet state of a dim phosphor to a covalently linked adjacent fluorescent dye in purely organic tandem luminophores doped into PVA matrix

Supplementary files

Article information

Article type
Paper
Submitted
22 окт 2018
Accepted
04 мар 2019
First published
04 мар 2019

J. Mater. Chem. C, 2019,7, 6571-6577

Almost complete radiationless energy transfer from excited triplet state of a dim phosphor to a covalently linked adjacent fluorescent dye in purely organic tandem luminophores doped into PVA matrix

J. Jõgela, A. Uri, L. Pålsson and E. Enkvist, J. Mater. Chem. C, 2019, 7, 6571 DOI: 10.1039/C8TC05325A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements