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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

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Instense red phosphors for UV light emitting diode devices.

Fa-Bin Cao¹, Yan-Wen Tian, Yong-Jie Chen

¹School of Materials and Metallurgy, Northeastern University, Shenyang 110004, PR China.

Journal of Nanoscience and Nanotechnology

|April 2, 2010

Summary

New red phosphors, Ca(x)Sr1-x-1.5y-0.5zMoO4:yEu3+ zNa+, were developed for light-emitting diodes (LEDs). These phosphors exhibit efficient excitation and bright red light emission, suitable for LED applications.

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Area of Science:

Materials Science
Solid-State Chemistry
Luminescence

Background:

Developing efficient red-emitting phosphors is crucial for advanced solid-state lighting applications.
Charge compensation mechanisms significantly impact phosphor performance in LEDs.
Europium-doped alkaline earth metal molybdates offer potential for red light emission.

Purpose of the Study:

To synthesize and characterize novel red phosphors based on Ca(x)Sr1-x-1.5y-0.5zMoO4:yEu3+ zNa+.
To investigate the influence of synthesis parameters on luminescence and crystal structure.
To evaluate the suitability of these phosphors for light-emitting diode (LED) applications.

Main Methods:

Solid-state reaction method for phosphor synthesis.
Photoluminescence spectroscopy for excitation and emission analysis.
X-ray diffraction (XRD) for crystal structure determination (implied).

Main Results:

Ca(x)Sr1-x-1.5y-0.5zMoO4:yEu3+ zNa+ phosphors were successfully synthesized.
Optimal properties were achieved by controlling charge compensator content, Ca2+ concentration, synthesis temperature, reaction time, and Eu3+ concentration.
Effective excitation was observed at 616 nm using UV (311 nm) and blue (395 nm, 465 nm) light sources.
The emission wavelengths (395 nm, 465 nm) are compatible with common LED chip emissions.
Calculated chromaticity coordinates (x=0.65, y=0.32) indicate pure red emission.
Bright red light emission was visually confirmed from LED-based devices.

Conclusions:

The synthesized Ca(x)Sr1-x-1.5y-0.5zMoO4:yEu3+ zNa+ phosphors demonstrate excellent potential for red light emission in LEDs.
Optimized synthesis conditions are key to achieving superior luminescent and structural properties.
The phosphors' excitation and emission characteristics make them highly suitable for integration into LED technology.