초록 ▼

An LED device is provided that has an excellent color rendering property and no toxicity and does not increase production costs more than necessary. A covering member is also provided used for such a device. The LED device comprises a light-emitting element for emitting light in a blue to green regi

An LED device is provided that has an excellent color rendering property and no toxicity and does not increase production costs more than necessary. A covering member is also provided used for such a device. The LED device comprises a light-emitting element for emitting light in a blue to green region and a fluorescent substance containing a red phosphor for converting the wavelength of the light emitted from the light-emitting element to another wavelength. The red phosphor is CaS activated by Eu or a phosphor expressed by the general formula AEu(1-x) LnxB2O8,wherein A is an element selected from the group consisting of Li, K, Na and Ag; Ln is an element selected from the group consisting of Y, La and Gd; and B is W or Mo; and x is number equal to or larger than 0, but smaller than 1.

대표청구항 ▼

1. A light-emitting diode device, comprising a light-emitting element for emitting light of blue to green region and a fluorescent substance containing a phosphor expressed by a general formula AEu(1-x) LnxB2O8for converting a wavelength of the light emitted from the light-emitting element, wher

1. A light-emitting diode device, comprising a light-emitting element for emitting light of blue to green region and a fluorescent substance containing a phosphor expressed by a general formula AEu(1-x) LnxB2O8for converting a wavelength of the light emitted from the light-emitting element, wherein A is an element selected from the group consisting of Li, K, Na and Ag; Ln is an element selected from the group consisting of Y, La and Gd; and B is W or Mo; and x is number equal to or larger than 0, but smaller than 1. 2. The light-emitting diode device according to claim 1, wherein the light-emitting element emits light having a wavelength of 400 nm to 600 nm. 3. The light-emitting diode device according to claim 1, wherein the fluorescent substance further contains a YxGd3-xAl5O2(0≤x≤3) phosphor activated by Ce. 4. The light-emitting diode device according to claim 3, wherein the light-emitting diode device has an average color rendering evaluation number (Ra) of 85 or larger. 5. The light-emitting diode device according to claim 3, wherein the light-emitting diode device has a special color rendering evaluation number R9of 80 or larger. 6. The light-emitting diode device according to claim 2, wherein a ratio (Ia:Ib) of emission intensity (Ia) of light having 470 nm±2 mn to emission intensity (Ib) of light having 610 to 640 nm is 1:0.5 to 1:2. 7. The light-emitting diode device according to claim 1, wherein the fluorescent substance is in the form of a layer placed on an outer surface of the light-emitting element. 8. The light-emitting diode device according to claim 1, wherein the fluorescent substance is made of a transparent resin containing the AEu(1-x) LnxB2O8phosphor and seals the light-emitting element. 9. The light-emitting diode device according to claim 1, wherein the light-emitting element is sealed with a transparent resin to form a sealed member, the sealed member is covered with a covering member including the fluorescent substance. 10. The light-emitting diode device according to claim 9, wherein the covering member is made from a polymer composition containing 100 parts by mass of a base polymer, 2 to 40 parts by mass of a phosphor expressed by AEu(1-x) LnxB2O8,and a YxGd3-xAl5O12phosphor activated by Ce. 11. The light-emitting diode device according to claim 10, wherein the base polymer comprises a rubber and/or a thermoplastic elastomer. 12. The light-emitting diode device according to claim 9, wherein the covering member is made from a polymer composition containing 100 parts by mass of a base polymer, 2 to 40 parts by mass of the AEu(1-x) LnxB2O8phosphor, and a YxGd3-xAl5O12phosphor activated by Ce. 13. The light-emitting diode device according to claim 12, wherein the base polymer comprises a rubber and/or a thermoplastic elastomer. 14. A covering member for covering a light-emitting diode device which includes a light-emitting element sealed by a transparent resin for emitting light in a blue to green region, comprising a base polymer, and a phosphor expressed by AEu(1-x) LnxB2O8wherein A is an element selected from the group consisting of Li, K, Na, and Ag; Ln is an element selected from the group consisting of Y, La and Gd; and B is W or Mo; and x is a number equal to or larger than 0, but smaller than 1. 15. The covering member according to claim 14, further comprising a YxGd3-xAl5O12phosphor activated by Ce.