Interference-enhanced infrared-to-visible upconversion in solid-state thin films sensitized by colloidal nanocrystals

Wu, Mengfei; Jean, Joel; Bulović, Vladimir; Baldo, Marc A.

doi:10.1063/1.4984136

Title: Interference-enhanced infrared-to-visible upconversion in solid-state thin films sensitized by colloidal nanocrystals

Journal Article · Mon May 22 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4984136· OSTI ID:1466223

^[1];

^[1]; Bulović, Vladimir ^[1]; Baldo, Marc A. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Energy Frontier Research Center for Excitonics

Infrared-to-visible photon upconversion has potential applications in photovoltaics, sensing, and bioimaging. In this paper, we demonstrate a solid-state thin-film device that utilizes sensitized triplet-triplet exciton annihilation, converting infrared photons absorbed by colloidal lead sulfide nanocrystals (NCs) into visible photons emitted from a luminescent dopant in rubrene at low incident light intensities. A typical bilayer device consisting of a monolayer of NCs and a doped film of rubrene is limited by low infrared absorption in the thin NC film. Here, we augment the bilayer with an optical spacer layer and a silver-film back reflector, resulting in interference effects that enhance the optical field and thus the absorption in the NC film. The interference-enhanced device shows an order-of-magnitude increase in the upconverted emission at the wavelength of λ = 610 nm when excited at λ = 980 nm. Finally, at incident light intensities above 1.1 W/cm², the device attains maximum efficiency, converting (1.6 ± 0.2)% of absorbed infrared photons into higher-energy singlet excitons in rubrene.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001088

OSTI ID:: 1466223

Alternate ID(s):: OSTI ID: 1361912

Journal Information:: Applied Physics Letters, Vol. 110, Issue 21; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Cited By (5)

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Title: Interference-enhanced infrared-to-visible upconversion in solid-state thin films sensitized by colloidal nanocrystals

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