Issue 49, 2021, Issue in Progress

CdSe nanocrystal sensitized photon upconverting film

Abstract

Here, films using CdSe nanocrystal (NC) triplet photosensitizers in conjunction with diphenylanthracene (DPA) emitters were assembled to address several challenges to practical applications for solution-based photon upconversion. By using poly(9-vinylcarbazole) as a phosphorescent host in this film, volatile organic solvents are eliminated, the spontaneous crystallization of the emitter is significantly retarded, and ∼1.5% photon upconversion quantum yield (out of a maximum of 50%) is obtained. Transient absorption spectroscopy on nanosecond-to-microsecond time scales reveals this efficiency is enabled by an exceptionally long triplet lifetime of 3.4 ± 0.3 ms. Ultimately, we find the upconversion efficiency is limited by incomplete triplet–triplet annihilation, which occurs with a rate 3–4 orders of magnitude slower than in solution-phase upconversion systems.

Graphical abstract: CdSe nanocrystal sensitized photon upconverting film

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2021
Accepted
10 Sep 2021
First published
20 Sep 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 31042-31046

CdSe nanocrystal sensitized photon upconverting film

E. M. Rigsby, T. Miyashita, D. A. Fishman, S. T. Roberts and M. L. Tang, RSC Adv., 2021, 11, 31042 DOI: 10.1039/D1RA06562A

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