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Photon Upconversion at Organic-Inorganic Interfaces

Journal Article · · Annual Review of Physical Chemistry
 [1];  [2];  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. University of Utah, Salt Lake City, UT (United States)
Photon upconversion is a process that combines low-energy photons to form useful high-energy photons. There are potential applications in photovoltaics, photocatalysis, biological imaging, etc. Semiconductor quantum dots (QDs) are promising for the absorption of these low-energy photons due to the high extinction coefficient of QDs, especially in the near infrared (NIR). This allows the intriguing use of diffuse light sources such as solar irradiation. In this review, we describe the development of this organic-QD upconversion platform based on triplet-triplet annihilation, focusing on the dark exciton in QDs with triplet character. Then we introduce the underlying energy transfer steps, starting from QD triplet photosensitization, triplet exciton transport, triplet-triplet annihilation, and ending with the upconverted emission. Design principles to improve the total upconversion efficiency are presented. We end with limitations in current reports and proposed future directions. This review provides a guide for designing efficient organic-QD upconversion platforms for future applications, including overcoming the Shockley-Queisser limit for more efficient solar energy conversion, NIR-based phototherapy, and diagnostics in vivo.
Research Organization:
University of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
Air Force of Scientific Research (AFOSR); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0022523
OSTI ID:
2568388
Journal Information:
Annual Review of Physical Chemistry, Journal Name: Annual Review of Physical Chemistry Journal Issue: 1 Vol. 75; ISSN 0066-426X; ISSN 1545-1593
Publisher:
Annual ReviewsCopyright Statement
Country of Publication:
United States
Language:
English

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