Journal
ACS ENERGY LETTERS
Volume 7, Issue 3, Pages 914-919Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c00017
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [51961165109, 22173098, 21975253]
Ask authors/readers for more resources
In recent years, there has been a growing interest in developing heavy-metal-free colloidal quantum dots as sensitizers for photochemistry. In this study, blue-emitting ZnSe/ZnS core/shell quantum dots were reported as molecular triplet sensitizers for photon upconversion in the ultraviolet-B region.
Recent years have seen a growing interest in developing heavy-metal-free colloidal quantum dots (QDs), such as InP, Si, and CuInS2, as sensitizers for photochemistry. None of these materials, however, could cover the blue part of the spectrum for applications such as blue-to-ultraviolet photon upconversion that is of particular interest for photocatalysis. Herein we report blue-emitting ZnSe/ZnS core/shell QDs as molecular triplet sensitizers for photon upconversion down to the <320 nm region (ultraviolet-B). The upconversion system consists of carboxylated biphenyl as transmitter ligands for QDs and functionalized naphthalene or biphenyl as annihilators (emitters), with the normalized quantum efficiency reaching 6.2 +/- 0.2%. Time-resolved spectroscopy reveals that triplet energy transfer from QDs to biphenyl is mediated by an electron transfer step, highlighting the strong reducing power of the band-edge electrons of ZnSe-related QDs that may play a unique role for photochemical applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available