National Institute of Advanced Industrial Science and Technology

Ping Yang

Norio Murase

Masanori Ando

Chunliang Li

An object of the present invention is to prepare a fine particle with high durability and high brightness, in which semiconductor nanoparticles are assembled. The present invention provides fluorescent fine particles comprising Cd- and Se-containing semiconductor nanoparticles dispersed in silicon-containing fine particles, wherein the average particle size of the silicon-containing fine particles is 20 to 100 nm, and the number of semiconductor nanoparticles dispersed in the silicon-containing fine particles is 10 or more.

Fluorescent particle, with semiconductor nanoparticles dispersed therein, fabricated by the sol-gel process

The present invention provides semiconductor-nanoparticle-dispersed small silica glass particles that emit bright fluorescent light with high fluorescence quantum yield and high density, compared to the conventional semiconductor-nanoparticle-dispersed small glass particles, and that have excellent fluorescence intensity stability over time; and a process for preparing the same. The semiconductor-nanoparticle-dispersed silica glass particles have a mean particle size of not less than 10 nanometers and not more than 5 micrometers, and contain a hydrolyzed alkoxide and semiconductor nanoparticles at a concentration of not less than 2&#xd7;10mol/l and not more than 1&#xd7;10mol/l. The particles emit fluorescent light with a fluorescence quantum yield (quantum yield) of 25% or more (and 60% or more), when dispersed in a solution.

Semiconductor-nanoparticle-dispersed small glass particles and process for preparing the same

The present invention provides a thin-film fluorescent material in which semiconductor nanoparticles in a stable condition maintain a high fluorescence quantum yield and can be held at a high concentration in a glass matrix. The present invention also provides optical devices using the thin-film fluorescent material, such as high-brightness displays and lighting systems. The present invention relates to a fluorescent material, in which semiconductor nanoparticles with a fluorescence quantum yield of 15% or more and a diameter of 2 to 5 nanometers are dispersed in a glass matrix at a concentration of 5&#xd7;10mol/l or more and a method for manufacturing the same.

Fluorescent material with semiconductor nanoparticles dispersed in glass matrix at high concentration and method for manufacturing such fluorescent material

Growing community of inventors

Ikeda, Japan

Ping Yang