Oxynitride Phosphors
Oxynitride Phosphors - Related Videos
07:03
Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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Cited by 2 •
2016
An excellent chemical and luminescence stabilities of (oxy)nitride phosphors present it as an promising alternative to currently used sulfide and oxide phosphors. In this paper, we present the way to investigate its local luminescence properties using low-energy cathodoluminescence (CL).
06:16
Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors
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2025
This study investigates the standard optical measurements of two persistent luminescent ceramics: SAO-B (blue) and SAO-G (green), such as thermoluminescence (TL) and persistent luminescence (PersL). By controlling electron trap depth, this work innovates 'temperature-resolved' and 'time-resolved' dynamic anti-counterfeiting methods.
01:21
The Phosphorus Cycle
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2019
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems. Biological Phosphorus Cycle Phosphorus is present in many...
05:41
Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Cited by 18 •
2017
This paper describes a novel method for the rapid manufacture of high quality bioinspired nanoscale hydroxyapatite. This biomaterial is of great significance in the manufacture of a wide range of innovative medical devices for clinical applications in orthopedics, craniofacial surgery and dentistry.
08:54
Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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Cited by 3 •
2016
A two dimensional model material of discotic zirconium phosphate was developed. The inorganic crystal with lamellar structure was synthesized by hydrothermal, reflux, and microwave-assisted methods. On exfoliation with organic molecules, layered crystals can be converted to monolayers, and nematic liquid crystal phase was formed at sufficient concentration of monolayers.
FAQs
Replacing oxygen with nitrogen modifies the anion sublattice, which changes the crystal structure, bonding covalency, and local crystal field around luminescent centers. These changes alter the energies involved in excitation and emission, allowing the material’s visible-light output to shift in color. The same compositional adjustment can also contribute to improved resistance to thermal quenching.
Activator ions, including rare-earth elements, provide the electronic states that interact with absorbed excitation energy. After excitation, an activator releases part of that energy as visible light, producing the observed photoluminescence. The host composition remains important because its oxygen-nitrogen environment influences the activator’s local crystal field and therefore affects the emitted color and thermal behavior.
The local crystal field is the electromagnetic environment created by surrounding ions in the crystal. In oxynitride phosphors, oxygen-to-nitrogen substitution changes this environment and can shift the energy levels associated with an activator ion. Consequently, researchers can relate composition and structure to changes in photoluminescence, especially when seeking broad and controllable visible-color output.
Researchers synthesize different oxynitride compositions and characterize them to connect structure, composition, and photoluminescence. Comparing these properties shows how changes in the oxygen-nitrogen framework influence emission color and thermal response. This structure-property approach helps identify compositions with optical behavior suited to lighting, display, or other optical-device requirements.
Their broad color tunability allows the emitted light to be adjusted through composition and activator selection, while their resistance to thermal quenching supports operation under conditions where heating could otherwise reduce brightness. In phosphor-converted LEDs, these properties help convert excitation energy into useful visible light and support color design for solid-state lighting.
Photoluminescence measurements show how efficiently a composition absorbs excitation energy and releases it as visible emission, including the resulting color. When these measurements are compared with structural and compositional data, researchers can determine how nitrogen content, crystal environment, and activator ions influence optical performance. The results guide evaluation for displays, LEDs, and optical devices.