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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Low-threshold lasing from colloidal CdSe/CdSeTe core/alloyed-crown type-II heteronanoplatelets.

Yuan Gao1, Mingjie Li, Savas Delikanli

  • 1LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, and The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, 639785, Singapore. hvdemir@ntu.edu.sg.

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Summary

Colloidal type-II heterostructures with alloyed crowns demonstrate lower threshold amplified spontaneous emission (ASE) and random lasing. These nanoplatelets exhibit enhanced charge transfer and reduced Auger recombination for efficient light-emitting devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Colloidal type-II heterostructures offer potential as solution-processed gain media due to spatially separated charges, suppressing Auger recombination and enabling tunable emission.
  • Previous type-II core/shell nanocrystals achieved amplified spontaneous emission (ASE), but high thresholds limited their application.

Purpose of the Study:

  • To achieve amplified spontaneous emission (ASE) at a lower threshold using novel CdSe/CdSeTe core/alloyed-crown nanoplatelets.
  • To investigate the underlying mechanisms responsible for enhanced optical properties in these heterostructures.

Main Methods:

  • Fabrication of CdSe/CdSeTe core/alloyed-crown nanoplatelets.
  • Characterization using femtosecond transient absorption, steady-state, and time-resolved photoluminescence (PL) spectroscopies.
  • Demonstration of amplified spontaneous emission (ASE) and random lasing.

Main Results:

  • Achieved ASE at a lower threshold with CdSe/CdSeTe core/alloyed-crown nanoplatelets.
  • Observed random lasing in films of these nanoplatelets.
  • Confirmed type-II band alignment and significantly improved properties compared to CdSe/CdTe counterparts: higher PL quantum yield (75% vs. 31%), increased type-II charge-transfer states, faster carrier transfer (0.32 ps vs. 0.61 ps), and slower Auger recombination (360 ps vs. 160 ps).

Conclusions:

  • CdSe/CdSeTe core/alloyed-crown nanoplatelets significantly outperform CdSe/CdTe nanoplatelets in terms of charge transfer, luminescence efficiency, and Auger recombination rates.
  • These findings highlight the excellent potential of alloyed-crown nanoplatelets for solution-processed lasers and light-emitting devices.