Sialon Group

Luminescent materials are one of key materials in solid state lighting and advanced flat panel displays that hold the promise of energy saving, environment friendliness and high quality. Our group concerns itself with both fundamental and industrial research and development in the field of advanced luminescent materials for energy and environment related applications. We are going to discover new highly efficient and reliable sialon phosphors with promising luminescence properties and interesting crystal structures for those applications, by careful materials selection and synthetic strategies. Great efforts are also made to clarify the composition-structure-property relationships to guide materials discovery, design and property enhancement.

Objective

◆ New phosphors discovery: A single-particle-diagnosis approach is used to search for nitride luminescent materials with new crystal structure and promising properties.
◆ Materials synthesis: Several synthetic techniques, such as gas-pressure sintering, hot-isostatic pressing, gas reduction and nitridation, are applied to prepare phosphor powders.
◆ Structure-property relations: Electronic and crystal structure of sialon phosphors, such as band structure, local structure, and valence of activators, are investigated by both calculation and experimental measurements, and are used to clarify the composition-structure-property relationships.
◆ Applications and devices: Solid state lighting devices for general illumination and LCD backlights with superior optical quality and reliability are prepared by using sialon phosphors.

"Sialon phosphors with abundant emission colors" Image

Sialon phosphors with abundant emission colors


"A single-particle-diagnosis approach for high-speed discovery of novel nitride phosphors" Image

A single-particle-diagnosis approach for high-speed discovery of novel nitride phosphors




Facilities

"Gas pressure sintering furnace" Image

Gas pressure sintering furnace


"Single crystal X-ray diffractometer" Image

Single crystal X-ray diffractometer



Selected Recent Results

"Transmittance of phosphor-in-glass (PiG) for solid state laser lighting" Image

Transmittance of phosphor-in-glass (PiG) for solid state laser lighting


"Wide color gamut LED backlights using narrow-band phosphors" Image

Wide color gamut LED backlights using narrow-band phosphors


"New phosphors by a single-particle-diagnosis approach (crystal structure and appearance)" Image

New phosphors by a single-particle-diagnosis approach (crystal structure and appearance)


"Single particle fluorescence microspectroscopy setups for measuring photoluminescence spectra (emission, excitation, temperature dependence) and quantum efficiency." Image

Single particle fluorescence microspectroscopy setups for measuring photoluminescence spectra (emission, excitation, temperature dependence) and quantum efficiency.



Group Leader

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Sialon Group
1-1 Namiki, Tsukuba, Ibaraki, 305-0044 JAPAN
E-Mail: HIROSAKI.Naoto=nims.go.jp(Please change "=" to "@")
National Institute for Materials Science (NIMS)
1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, JAPAN
TEL.+81-(0)-29-859-2000
FAX.+81-(0)-29-859-2029