Patent ID: 8896004
Filing Date: 2014-11-25
Classification: C09K,G02F,H01L

Abstract:
1. A white LED comprising at least one light emitting element selected from ultraviolet light emitting diodes, purple light emitting diodes, ultraviolet light emitting lasers, and purple light emitting lasers, and a phosphor layer, the phosphor layer comprising a green phosphor satisfying general formula 1, a blue phosphor satisfying general formula 2 or 3, and a red phosphor satisfying general formula 4: green phosphor: a trivalent cerium- and terbium-activated rare earth boride phosphor substantially represented by wherein M represents at least one element selected from Sc (scandium), Y (yttrium), La (lanthanum), Gd (gadolinium), and Lu (lutetium); and x and y are respective numbers of 0.05<x<0.1 and 0.05<y<0.2; blue phosphor: a divalent europium-activated halophosphate phosphor substantially represented by wherein M2 represents at least one element selected from Mg (magnesium), Ca (calcium), Sr (strontium), and Ba (barium) or a divalent europium-activated aluminate phosphor substantially represented by wherein M3 represents at least one element selected from Mg (magnesium), Ca (calcium), Sr (strontium), Ba (barium), Zn (zinc), Li (lithium), Rb (rubidium), and Cs (cesium); and a and b are respective numbers of 0<a, 0<b, and 0.2≦a/b≦1.5; and red phosphor: a europium-activated lanthanum oxysulfide phosphor represented by wherein x is a number satisfying 0.01<x<0.15, wherein the white LED is for backlight in liquid crystal display devices.