Ultra-fine particles dispersed glass and display device using the same

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PROBLEM TO BE SOLVED : To provide a phosphor having higher luminance than conventional rare earth ion phosphors and excellent in light resistance, time stability, etc. SOLUTION : The ultrafine particle-dispersed glass is obtained by dispersing ultrafine semiconductor particles having >=3% luminous efficiency in silicon dioxide-containing gas at >=10-9 mol/cm3 concentration of particles.