| 主权项 |
1. A device comprising:
a light emitting device comprising:
a light emitting element adapted to emit a blue light,a sealing resin covering the light emitting element, anda sulfide phosphor-containing layer disposed separate from the sealing resin; and a light guide plate, wherein the sealing resin includes one or both of:
(i) a KSF phosphor, wherein the KSF phosphor is a compound having the chemical formula:
A2 [M1−aMn4+aF6]where A is at least one selected from the group consisting of K+, Li+, Na+, Rb+, Cs+and NH4+,M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and0<a<0.2; andthe KSF phosphor is adapted to absorb at least a portion of the blue light emitted from the light emitting element to emit red light, and(ii) a MGF phosphor, wherein the MGF phosphor is a compound having the chemical formula:
(x−a)MgO.(a/2)Sc2O3.yMgF2.cCaF2.(1−b)GeO2.(b/2)Mt2O3:zMn4+where 2.0≦x≦4.0,0<y<1.5,0<z<0.05,0≦a<0.5,0<b<0.5,0≦c<1.5y+c <1.5, andMt is at least one element selected from Al, Ga and In, andthe MGF phosphor is adapted to absorb at least a portion of the blue light emitted from the light emitting element to emit red light; and wherein the sulfide phosphor-containing layer includes a sulfide phosphor having the chemical formula:
M1Ga2S4:Eu which is a thiogallate phsophor activated with Eu, where M1 is at least one selected from Mg, Ca, Sr and Ba, and the sulfide phosphor is adapted to absorb at least a portion of the blue light emitted from the light emitting element to emit green light, wherein the sealing resin is disposed facing a lateral surface of the light guide plate, and the sulfide phosphor-containing layer is disposed facing an upper surface of the light guide plate. |
