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A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

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Temperature dependent red luminescence from a distorted Mn4+ site in CaAl4O7:Mn4+.

Pengfei Li¹, Mingying Peng, Xuewen Yin

¹State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, School of Materials Science and Technology, South China University of Technology, Guangzhou 510640, China.

|August 14, 2013

Summary

The study investigates manganese-doped calcium aluminate (CaAl4O7:Mn) phosphors for white light-emitting diodes (WLEDs). It reveals that distorted Mn(4+) sites cause thermal quenching, impacting phosphor performance at high temperatures.

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Area of Science:

Materials Science
Solid-State Chemistry
Luminescence

Background:

Phosphor-converted white light-emitting diodes (pc-WLEDs) are crucial for energy-efficient lighting.
Understanding thermal luminescence quenching is vital for high-power WLED performance.
Manganese (Mn(4+)) doping in phosphors is explored for red light emission.

Purpose of the Study:

To synthesize and characterize CaAl4O7:Mn phosphors.
To investigate the luminescence properties of Mn(4+) in CaAl4O7 across a wide temperature range (10-500K).
To elucidate the thermal quenching mechanism of Mn(4+) luminescence in this material.

Main Methods:

Solid-state synthesis of CaAl4O7:Mn using boric acid as a flux.
Low and high-temperature photoluminescence spectroscopy (10-500K).
Analysis of luminescence spectra and decay curves to determine quenching mechanisms.

Main Results:

CaAl4O7:Mn phosphors exhibit red luminescence originating from Mn(4+) ions substituting calcium sites.
Severe thermal quenching was observed, particularly at distorted octahedral Mn(4+) sites.
The material can be synthesized in pure phase, even with boric acid flux.

Conclusions:

The study identifies distorted octahedral Mn(4+) sites as the primary cause of thermal quenching in CaAl4O7:Mn.
This finding provides insights into the thermal stability limitations of Mn(4+)-based phosphors.
It suggests a strategy for designing future Mn(4+) phosphors with enhanced thermal resistance for pc-WLED applications.