LUMINESCENT COMPOSITE MATERIAL AND LIGHT-EMITTING DEVICE BASED THEREON Russian patent published in 2013 - IPC C09K11/00 B32B7/02 H01L33/26 B82B1/00 B82Y30/00 

FIELD: chemistry.

SUBSTANCE: luminescent composite material contains a polymer base 1 made of an optically transparent polymer material and a phosphor-containing multilayer polymer film consisting of three layers: optically transparent polymer film 2; polymer composition 3, including an inorganic phosphor - cerium-doped yttrium-aluminium garnet, or cerium-doped gallium-gadolinium garnet; polymer composition 4 with dispersed semiconductor nanocrystals made of a semiconductor nucleus, first and second semiconductor layers, and emitting a fluorescent signal with fluorescence peaks in the wavelength range of 580-650 nm. Layers of the multilayer polymer film can also be arranged in the following order: polymer composition 3 containing a phosphor, polymer composition 4 with dispersed semiconductor nanocrystals, optically transparent polymer film 2. The light-emitting device contains a luminescent composite material situated away from a light source. The light source is in form of a light-emitting diode with radiation wavelength of 430-470 nm. The light-emitting devices have service life longer than 50000 h, luminous efficacy higher than 100 lm/W and correlated colour temperature of 2500-5000 K.

EFFECT: invention enables to obtain white light with colour rendering index of more than 80.

48 cl, 14 dwg