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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Related Experiment Video

Updated: May 31, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
10:41

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

Blue-Emitting ZnSe(Te) Quantum Dots and Light-Emitting Diodes.

Lijin Wang1,2, Aiwei Tang3, Jingbi You1,2

  • 1State Key Laboratory of Semiconductor Physics and Chip Technologies, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 29, 2026
PubMed
Summary

Zinc selenide (ZnSe) quantum dots (QDs) are promising cadmium-free blue emitters. Doping with tellurium (ZnSeTe) enhances performance, achieving high efficiency and long lifetimes for potential commercialization in quantum dot light-emitting diodes (QLEDs).

Keywords:
ZnSe(Te) quantum dotsblue emissionlight‐emitting diodes

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Zinc-based quantum dots (QDs), particularly ZnSe, are leading cadmium-free alternatives for blue light emission.
  • ZnSe QDs offer narrow full width at half maximum (FWHM), high photoluminescence quantum yield (PLQY), and stability.
  • ZnSe/ZnS core-shell structures demonstrated high performance in quantum dot light-emitting diodes (QLEDs) with 13.6% external quantum efficiency (EQE).

Purpose of the Study:

  • To review recent advancements in blue-emitting ZnSe(Te) quantum dots.
  • To provide a comprehensive overview of material properties, synthesis, and optimization strategies for ZnSe(Te) QDs.
  • To analyze LED device construction and identify challenges and solutions for ZnSe(Te) QLED commercialization.

Main Methods:

  • Systematic discussion of ZnSe(Te) QD material properties and synthesis techniques.
  • Analysis of optimization strategies for enhancing QD performance.
  • Examination of LED device engineering, including emitting and carrier transport layers.

Main Results:

  • ZnSeTe QDs, developed by doping ZnSe with Te, extend the blue emission range.
  • ZnSeTe QLEDs achieved a maximum EQE of 24.7% at 460 nm, rivaling cadmium-based QLEDs.
  • Exceptional half-lifetime of nearly 30,000 hours at 100 cd/m² indicates strong commercial potential.

Conclusions:

  • Blue-emitting ZnSe(Te) QDs show significant promise for display applications.
  • Optimization of material synthesis and device architecture is crucial for performance enhancement.
  • Addressing current challenges can accelerate the commercialization of ZnSe(Te) QLEDs.