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Related Concept Videos

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...
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...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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Related Experiment Video

Updated: Jun 16, 2026

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
07:03

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

Published on: November 15, 2016

ZnB2O4:Bi3+,Eu3+:a highly efficient, red-emitting phosphor.

Wei-Ren Liu1, Chun Che Lin, Yi-Chen Chiu

  • 1Material and Chemical Research Laboratories, ITRI, Hsinchu 300, Taiwan, ROC.

Optics Express
|February 23, 2010
PubMed
Summary

A novel red phosphor, zinc borate doped with europium (Eu3+) and bismuth (Bi3+), shows enhanced luminescence and thermal stability. This material demonstrates potential for use in white light-emitting diodes (LEDs).

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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07:12

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Luminescent materials are crucial for optoelectronic devices.
  • Europium (Eu3+)-doped materials are known for their red emission.
  • Developing efficient and stable red phosphors is essential for advanced lighting applications.

Purpose of the Study:

  • To synthesize and characterize a novel red phosphor based on ZnB(2)O(4).
  • To investigate the effect of Eu3+ and Bi3+ co-doping on luminescence properties.
  • To evaluate the potential of the developed phosphor for white light-emitting diode (LED) applications.

Main Methods:

  • Solid-state reaction method for phosphor synthesis.
  • Photoluminescence spectroscopy for emission and excitation analysis.
  • Composition optimization through doping concentration variation.

Main Results:

  • The optimized (Zn(0.9)Eu(0.1))B(2)O(4) phosphor exhibits a strong red emission peak at 610 nm.
  • Co-doping with Bi3+ ions enhanced emission intensity by 14% and quantum efficiency by 6%.
  • The (Zn(0.8)Bi(0.1)Eu(0.1))B(2)O(4) phosphor demonstrated superior luminescence and thermal stability compared to La(2)O(2)S:Eu(3+).

Conclusions:

  • A novel, highly efficient red-emitting ZnB(2)O(4):Eu3+, Bi3+ phosphor was successfully synthesized.
  • Bismuth co-doping significantly boosts the luminescence performance of the europium-activated zinc borate.
  • This red phosphor holds promise for the development of next-generation white LEDs.