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Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals
- Source :
- Nature Photonics. 10:31-34
- Publication Year :
- 2015
- Publisher :
- Springer Science and Business Media LLC, 2015.
-
Abstract
- Lead sulphide colloidal nanocrystals offer a solid-state answer for infrared-to-visible upconversion. Optical upconversion via sensitized triplet–triplet exciton annihilation converts incoherent low-energy photons to shorter wavelengths under modest excitation intensities1,2,3. Here, we report a solid-state thin film for infrared-to-visible upconversion that employs lead sulphide colloidal nanocrystals as a sensitizer. Upconversion is achieved from pump wavelengths beyond λ = 1 μm to emission at λ = 612 nm. When excited at λ = 808 nm, two excitons in the sensitizer are converted to one higher-energy state in the emitter at a yield of 1.2 ± 0.2%. Peak efficiency is attained at an absorbed intensity equivalent to less than one sun. We demonstrate that colloidal nanocrystals are an attractive alternative to existing molecular sensitizers, given their small exchange splitting, wide wavelength tunability, broadband infrared absorption, and our transient observations of efficient energy transfer. This solid-state architecture for upconversion may prove useful for enhancing the capabilities of solar cells and photodetectors.
- Subjects :
- Materials science
Infrared
business.industry
Exciton
Physics::Optics
Photodetector
Infrared spectroscopy
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
Photon upconversion
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Quantum dot
Excited state
Optoelectronics
Thin film
0210 nano-technology
business
Subjects
Details
- ISSN :
- 17494893 and 17494885
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Nature Photonics
- Accession number :
- edsair.doi...........13cea51433e5762b0abf49a84870093e