摘要:
For enhancing emission efficiency and color rendering of light emitting device, it comprises: a light source 3; a first emitting section 4 having a luminescent material emitting light including a wavelength component longer than that of light from said light source 3 when excited by light from light source 3; a second emitting section 5 having a luminescent material emitting light including a wavelength component longer than that of light from first emitting section 4 when excited by light from light source 3 and first emitting section 4; and a light exit side 1A from which light from light source 3, first light-emitting section 4 and second light-emitting section 5 emerges outside; wherein first emitting section 4 and second emitting section 5 are opened at light exit side 1A, and area of boundary surface X1 between first emitting section 4 and second emitting section 5 is equal to or less than fifty percent of surface area of first emitting section 4.
摘要:
A ceramic implant comprising a sintered body of zirconia and a coating layer of a porous sintered body of a mixture comprising .alpha.-tricalcium phosphate and zirconia, or hydroxyapatite and zirconia formed on the surface of the sintered body of zirconia.
摘要:
To attain a high color reproducibility as a whole image without impairing the brightness of the entire image. A color image display device comprising a combination of light shutters, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination, wherein a light source to be used for the backlight comprises a combination of a blue or deep blue LED and a phosphor, and the relationship between the NTSC ratio W as a color reproduction range of the color image display element and the light use efficiency Y is represented Y≧−0.38 W+51 (wherein W≧87).
摘要:
To enhance luminance and color rendering of a light emitting device comprising phosphors as wavelength converting material andat least one semiconductor light emitting device that emits visible light, as said phosphors, are used phosphors which are one or more kinds of phosphors selected from a group consisting of oxides, oxynitrides and nitrides, and are a mixture consisting of two or more kinds of phosphors whose luminous efficiency is 35% or higher when excited by the visible light from said semiconductor light emitting device at room temperature. In addition, said mixture contains a first phosphor, and a second phosphor that is different from said first phosphor and capable of absorbing emitted light from said first phosphor, and said first phosphor is contained 85 weight % or more of said mixture of phosphors.
摘要:
A method for producing a CASN phosphor which has an emission peak wavelength in a long wavelength range and which is prevented from being reduced in emission peak intensity, a phosphor suitable for use in displays having a NTSC ratio higher than that of conventional one, a composition containing the phosphor, a light-emitting device containing the phosphor, a display, and a lighting system. A method for producing an inorganic compound represented by the following formula from a feedstock in which the amount of Si is greater than one mole and less than 1.14 moles per mole of Al: M1aM2bAlSiX3 (I) where M1 represents an activation element containing at least Eu, M2 represents one or more selected from alkaline-earth metal elements, X represents one or more selected from the group consisting of O and N, and a and b each represent a positive number satisfying the inequalities 0
摘要:
To provide a phosphor having nearly spherical shapes, the phosphor has an elemental ratio represented by the formula below, and contains at least two kinds of Li, Na, K, Rb, Cs, P, Cl, F, Br, I, Zn, Ga, Ge, In, Sn, Ag, Au, Pb, Cd, Bi and Ti. M1aM2bM3cOd (M1 represents Cr, Mn, Fe, Co, Ni, Cu, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm or Yb, M2 mainly represents a bivalent metal element, M3 mainly represents a trivalent metal element, and a, b, c and d are 0.0001≦a≦0.2, 0.8≦b≦1.2, 1.6≦c≦2.4 and 3.2≦d≦4.8, respectively.)
摘要:
To enhance luminance and color rendering of a light emitting device comprising phosphors as wavelength converting material andat least one semiconductor light emitting device that emits visible light, as said phosphors, are used phosphors which are one or more kinds of phosphors selected from a group consisting of oxides, oxynitrides and nitrides, and are a mixture consisting of two or more kinds of phosphors whose luminous efficiency is 35% or higher when excited by the visible light from said semiconductor light emitting device at room temperature. In addition, said mixture contains a first phosphor, and a second phosphor that is different from said first phosphor and capable of absorbing emitted light from said first phosphor, and said first phosphor is contained 85 weight % or more of said mixture of phosphors.
摘要:
A phosphor (A) comprising a host material composed of a compound having a garnet crystal structure represented by the general formula (I): M1aM2bM3cOd (I) (wherein M1 is a divalent metal element, M2 is a trivalent metal element, M3 is a tetravalent metal element containing at least Si, a is the number of 2.7 to 3.3, b is the number of 1.8 to 2.2, c is the number of 2.7 to 3.3, and d is the number of 11.0 to 13.0), and a luminescent center ion incorporated in the host material; a light emitting device (B) comprising the phosphor as a wavelength conversion material and a semiconductor light emitting element capable of emitting a light in the range of from ultraviolet light to visible light; and a display (C) and a lighting system (D) using the light emitting device (B) as a light source. The above phosphor can be readily produced, and can provide a light emitting device having a high color rendering property.
摘要:
To achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x1(17.5) and the color coordinate y1(17.5) of the light emitted at a driving current density of 17.5 A/cm2 and the color coordinate x1(70) and the color coordinate y1(70) of the light emitted at a driving current density of 70 A/cm2 satisfy the following Expressions (D) and (E): −0.006≦x1(17.5)−x1(70)≦0.006 (D), −0.006≦y1(70)−y1(70)≦0.006 (E).