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Related Experiment Video

Updated: May 2, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors

Low-energy Cathodoluminescence for OxyNitride Phosphors

Published on: November 15, 2016

Color tunable NaCaLa(MoO₄)₃: Tb³⁺, Eu³⁺ phosphors for LED and optical anti-counterfeiting.

Yuqi Wang¹, Yunfei Li¹, Zhe Qiu¹

¹Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

|December 25, 2025

Summary

New phosphors offer tunable colors from green to red by adjusting europium (Eu³⁺) concentration. This energy transfer enables applications in warm white LEDs and anti-counterfeiting technologies.

Keywords:

Anti-counterfeiting LED Phosphors

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Area of Science:

Materials Science
Solid-State Chemistry
Luminescence

Background:

Developing novel phosphors is crucial for advanced lighting and security applications.
Tuning luminescence properties of materials is key to achieving specific functionalities like warm white light emission and anti-counterfeiting.

Purpose of the Study:

To synthesize and characterize NaCaLa(MoO₄)₃ phosphors doped with terbium (Tb³⁺) and europium (Eu³⁺).
To investigate the mechanism of color modulation and energy transfer between Tb³⁺ and Eu³⁺ ions.
To evaluate the potential of these phosphors for warm white light-emitting diode (LED) devices and optical anti-counterfeiting.

Main Methods:

Synthesis of NaCaLa(MoO₄)₃: Tb³⁺, Eu³⁺ phosphors using the high-temperature solid-state method.
Analysis of material properties, including luminescence spectra and energy transfer mechanisms (dipole-dipole interaction).
Fabrication of warm white LED devices incorporating the synthesized phosphors and commercial blue phosphors.

Main Results:

Continuous modulation of luminescent color from green to red was achieved by varying Eu³⁺ concentration.
Energy transfer from Tb³⁺ to Eu³⁺ ions, following a dipole-dipole interaction, was identified as the mechanism for color tuning.
Fabricated warm white LED devices demonstrated a color rendering index (CRI) of 84.8 and a correlated color temperature (CCT) of 3244 K.
The phosphor exhibited distinct luminescent colors under different excitation wavelengths, suitable for anti-counterfeiting applications.

Conclusions:

The synthesized NaCaLa(MoO₄)₃: Tb³⁺, Eu³⁺ phosphors exhibit tunable luminescence properties.
These phosphors show significant potential for use in warm white LED lighting and optical anti-counterfeiting technologies due to their unique photoluminescent characteristics.