Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 5, Pages 1426-1431Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03519
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Funding
- IISER Kolkata
- SERB-DST India [CRG/2019/003605]
- DST-INSPIRE
- CSIR
- SERB project
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This research reports the achievement of near-unity photoluminescence quantum yield and highly suppressed blinking in a toxic-metal-free quantum dot, making it suitable for single-particle tracking and bioimaging purposes.
There is no literature report of simultaneously achieving near-unity PLQY (ensemble level) and highly suppressed blinking (ultrasensitive single-particle spectroscopy (SPS) level) in a toxic-metal-free QD. In this Letter we report accomplishing near-unity PLQY (96%) and highly suppressed blinking (>80% ON fraction) in a toxic-metal-free CuInS2/ZnSeS Core/Alloy-Shell (CAS) QD. In addition, (i) gigantic enhancement of PLQY (from 15% (Core) to 96% (CAS QD)), (ii) ultrahigh stability over 1 year without significant reduction of PLQY at the ensemble level, (iii) high magnitude (nearly 3 times) of electron detrapping/trapping rate, and (iv) very long ON duration (similar to 2 min) without blinking at the SPS level enable this ultrasmall (similar to 3.3 nm) CAS QD to be quite suitable for single-particle tracking/bioimaging. A model explaining all these excellent optical properties has been provided. This ultrabright CAS QD has been successfully utilized toward fabrication of low-cost microcontroller-based stable and bright yellow and white QD-LEDs.
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