Giant photoluminescence blinking of perovskite nanocrystals reveals single-trap control of luminescence.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 25706329.
- Also identified by DOI 10.1021/nl5041397.
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Abstract
Fluorescence super-resolution microscopy showed correlated fluctuations of photoluminescence intensity and spatial localization of individual perovskite (CH3NH3PbI3) nanocrystals of size ∼200 × 30 × 30 nm(3). The photoluminescence blinking amplitude caused by a single quencher was a hundred thousand times larger than that of a typical dye molecule at the same excitation power density. The quencher is proposed to be a chemical or structural defect that traps free charges leading to nonradiative recombination. These trapping sites can be activated and deactivated by light.
Medical subject headings
- Calcium Compounds
- Crystallization
- Luminescent Measurements
- Nanoparticles
- Oxides
- Titanium