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Related Experiment Video

Updated: May 9, 2026

Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

Published on: December 5, 2025

Surface patterning of nonscattering phosphors for light extraction.

An Mao¹, Robert F Karlicek

¹Smart Lighting Engineering Research Center, Rensselaer Polytechnic Institute, Troy, New York 12180, USA. maoanjoy@gmail.com

|August 2, 2013

Summary

Researchers enhanced yellow ceramic plate phosphor (CPP) emission by fabricating a titanium dioxide (TiO₂) photonic crystal layer. This photonic crystal structure (PhC) improved forward light emission by 4.5 times and collimated the light output.

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Last Updated: May 9, 2026

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Published on: December 5, 2025

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

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Published on: November 15, 2016

Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Yttrium aluminum garnet doped with cerium (YAG:Ce) is a widely used yellow phosphor.
Enhancing the forward emission and light extraction efficiency of phosphors is crucial for applications like solid-state lighting and displays.
Conventional phosphors often suffer from isotropic emission, leading to light loss.

Purpose of the Study:

To enhance the forward emission of Yttrium aluminum garnet doped with cerium (YAG:Ce) yellow ceramic plate phosphor (CPP).
To investigate the effect of a two-dimensional titanium dioxide (TiO₂) photonic crystal layer on phosphor emission characteristics.
To achieve a more collimated light output from the patterned phosphor.

Main Methods:

Fabrication of a two-dimensional TiO₂ photonic crystal layer on a YAG:Ce CPP using molecular transfer lithography.
Utilizing polyvinyl alcohol nanostructured templates to define a triangle lattice pattern.
Characterization of the emission properties of both patterned and non-patterned YAG:Ce CPP.

Main Results:

A significant 4.5-fold improvement in yellow emission intensity was observed for the photonic-crystal-structure (PhC) patterned YAG:Ce CPP compared to the non-patterned sample.
The PhC-patterned YAG:Ce CPP exhibited a highly collimated far-field emission pattern.
Non-patterned and randomly patterned samples showed a much less directed emission pattern.

Conclusions:

The integration of a TiO₂ photonic crystal layer effectively enhances the forward emission of YAG:Ce CPP.
Photonic crystal patterning provides a viable method to control and improve light extraction efficiency and directionality in phosphors.
This approach holds promise for developing advanced lighting and display technologies with improved performance.