Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Massachusetts Inst. of Technology, Cambridge, MA (United States)
- 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.
- Research Organization:
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE; 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, Journal Name: Applied Physics Letters Journal Issue: 21 Vol. 120; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Using quantum dot photoluminescence for load detection
Journal Article
·
Mon Aug 15 00:00:00 EDT 2016
· AIP Advances
·
OSTI ID:22611409