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Related Experiment Video

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

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Published on: November 15, 2016

Synthesis, characterization, luminescence and defect centres in CaYAl3O7:Eu3+ red phosphor.

Vijay Singh¹, S Watanabe, T K Gundu Rao

¹Mechanical Engineering Department, Chung-Ang University, Seoul, Korea. vijayjiin2006@yahoo.com

Journal of Fluorescence

|October 2, 2010

Summary

Europium-doped CaYAl(3)O(7) phosphors were synthesized at low temperatures. Electron Spin Resonance identified defect centers, correlating F(+) centers with high-temperature thermoluminescence peaks.

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Area of Science:

Solid State Chemistry
Materials Science
Luminescence

Background:

Europium-doped phosphors are crucial for lighting and display technologies.
Understanding defect centers is key to optimizing phosphor performance.

Purpose of the Study:

To synthesize and characterize Eu(3+)-doped CaYAl(3)O(7) phosphor.
To identify defect centers responsible for thermoluminescence using Electron Spin Resonance (ESR).

Main Methods:

Solution combustion synthesis at 550°C.
Powder X-ray diffraction (XRD) for structural confirmation.
Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FT-IR), and Photoluminescence (PL) for characterization.
Electron Spin Resonance (ESR) for defect center identification.

Main Results:

Crystalline CaYAl(3)O(7):Eu(3+) was successfully synthesized.
Photoluminescence showed a dominant red emission at 618 nm from Eu(3+) (5)D(0)-(7)F(2) transition.
ESR identified O(-) and F(+) centers in irradiated samples.
F(+) centers correlated with high-temperature thermoluminescence peaks.

Conclusions:

The solution combustion method enables low-temperature synthesis of CaYAl(3)O(7):Eu(3+) phosphors.
ESR spectroscopy effectively identifies defect centers, specifically F(+) centers, linked to thermoluminescence properties.