Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence

Xie, Sihan; Zhu, Han; Li, Melissa; Bulović, Vladimir

doi:10.1063/5.0093248

Title: Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence

Journal Article · Mon May 23 00:00:00 EDT 2022 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0093248· OSTI ID:1979088

^[1]; Zhu, Han ^[1];

^[1];

^[1]

Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

Active modulation of quantum dot thin film photoluminescence (PL) has been far-reaching potential applications in biomedical and optoelectronic systems, but challenges remain in achieving large PL modulation depth and fast temporal response. Here, we report an efficient voltage-controlled optical down-converter by optically exciting a colloidal quantum dot thin film within a quantum dot light-emitting diode under reverse bias. Utilizing field-induced luminescence quenching, we show that a large electric field can strongly modify carrier dynamics in this nanostructured device, resulting in stable and reversible photoluminescence quenching. The device exhibits photoluminescence reduction of up to 99.5%, corresponding to a contrast ratio of 200:1 under the applied electric field of 3 MV cm ⁻¹ with a 300 ns response time. Using excitation wavelength dependent and transient PL spectroscopy, we further show that the high degree of quenching is achieved by a synergistic interplay of quantum-confined Stark effect and field-induced exciton dissociation.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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

Grant/Contract Number:: SC0001088

OSTI ID:: 1979088

Alternate ID(s):: OSTI ID: 1869363

Journal Information:: Applied Physics Letters, Vol. 120, Issue 21; ISSN 0003-6951

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

Country of Publication:: United States

Language:: English

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Title: Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence

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