106 results about "Nitride phosphor" patented technology

To provide a phosphor containing a comparatively much red component and having high light emitting efficiency, high brightness and further high durability, the nitride phosphor is represented by the general formula L_XM_YN_{((2/3)X+(4/3)Y)}:R or L_XM_YO_ZN_{((2/3)X+(4/3)Y−(2/3)Z)}:R (wherein L is at least one or more selected from the Group II Elements consisting of Mg, Ca, Sr, Ba and Zn, M is at least one or more selected from the Group IV Elements in which Si is essential among C, Si and Ge, and R is at least one or more selected from the rare earth elements in which Eu is essential among Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Lu.); contains the another elements.

A light-emitting device includes a light-emitting element emitting primary light and a wavelength conversion portion absorbing a part of the primary light and emitting secondary light having a wavelength equal to or longer than the wavelength of the primary light. The wavelength conversion portion includes a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors. The green or yellow light-emitting phosphor is implemented by at least one selected from a specific europium (II)-activated silicate phosphor (A-1) and a specific cerium (III)-activated silicate phosphor (A-2). The red light-emitting phosphor is implemented by a specific europium (II)-activated nitride phosphor (B). The light-emitting device emitting white light at efficiency and color rendering property higher than in a conventional example can thus be provided.

There are provided a phosphor which is a divalent europium-activated oxynitride phosphor substantially represented by General formula (A): Eu_aSi_bAl_cO_dN_e, a divalent europium-activated oxynitride phosphor substantially represented by General formula (B): MI_fEu_gSi_hAl_kO_mN_n or a divalent europium-activated nitride phosphor substantially represented by General formula (C): (MII_l-pEu_p)MIIISiN₃, having a reflectance of light emission in a longer wavelength region of visible light than a peak wavelength of 95% or larger, and a method of producing such phosphor; a nitride phosphor and an oxynitride phosphor which emit light efficiently and stably by the light having a wavelength ranging from 430 to 480 nm from a semiconductor light emitting device by means of a light emitting apparatus using such phosphor, and a producing method of such phosphor; and a light emitting apparatus having stable characteristics and realizing high efficiency.

A red nitride phosphor of formula (I) or (II), and two green phosphors of formulas (III) and/or (IV) are included.

M_wAl_xSi_yB_zN_{((2/3)w+x+(4/3)y+z)}:Eu²⁺  (I)

M is any of Mg, Ca, Sr and Ba, and 0.5≦w≦3, x=1, 0.5≦y≦3 and 0≦z≦0.5,

M_pSi_qN_{((2/3)p+(4/3)q)}:EU²⁺  (II)

1.5≦p≦2.5 and 4.5≦q≦5.5,

M_xMgSi_zO_aX_b:Eu²⁺  (III)

M is any of Ca, Sr, Ba, Zn and Mn, X is any of F, Cl, Br and I, and 6.5≦x≦8.0, 3.7≦z≦4.3, a=x+1+2z−b/2 and 1.0≦b≦1.9,

Si_cAl_dO_fN_g:Eu²⁺  (IV)

c+d=6, 5.0≦c<6, 0<d≦1.0, 0.001<f≦1, 7≦g<8.

PROBLEM TO BE SOLVED: To provide a white-emitting phosphor excellent in light-emitting characteristics, and to provide a phosphor exhibiting light-emitting characteristics featured in high luminance in a extremely high yield.SOLUTION: The method for manufacturing a nitride phosphor comprising as an essential constituent element at least nitrogen and represented by L<SB>x</SB>M<SB>y</SB>N(2/3X+4/3Y):Z, which has at least one second emission spectrum obtained by converting at least a part of a first emission spectrum within a region different from a region of the first emission spectrum, comprises a step for calcination in an ammonia atmosphere. In the formula, L is selected among Be, Mg, Ca, Sr, Ba, Zn, Cd and Hg; M is selected among C, Si, Ge, Sn, Ti, Zr and Hf; and Z is an activator.

The invention provides an (oxy) nitride phosphor, a white light emitting device comprising the (oxy) nitride phosphor, a method for preparing the (oxy) nitride phosphor and the nitride phosphor prepared by the method. The (oxy)nitride phosphor is the compound represented by the formula 1; M is the alkaline-earth metal; furthermore x is more than 1 and less than 1; a is more than 1.8 and less than 2.2; b is more than 4.5 and less than 5.5; c is more than or equal to 0 and less than 8; d is more than 0 and less than or equal to 8; c+d is more than 0 and less than or equal to 8. The (oxy) nitride phosphor produces red light suitable for use in UV-LED and blue-LED type white light-emitting devices and achieves good efficiency.

The invention relates to a preparation method for a nitride phosphor/glass composite luminescent sheet layer. The preparation method comprises the steps of mixing glass components uniformly, melting to obtain a molten glass liquid, wherein the glass components comprise, by mass, 60-70% % of Bi2O3, 20-30% of B2O3, 6-8% of ZnO and 2-4% of Al2O3; water quenching, drying, grinding and screening to obtain glass powder; mixing phosphor powder and the glass powder uniformly to obtain mixed powder; then spreading the mixed powder on a mold; tabletting; carrying out heat treatment for 0.5-1.5 h at a temperature of 500-600 DEG C; and cooling to obtain the nitride phosphor/glass composite luminescent sheet layer. The preparation method is simple, and has low requirements for equipment. The phosphor/glass composite luminescent sheet layer provided by the invention has the advantages of high luminescent intensity, good heat stability and good mechanical strength. Besides, the phosphor/glass composite luminescent sheet layer is simple in preparation, and has good application prospects in laser phosphor display (LPD) display.

The present disclosure relates to a producing method for oxynitride or nitride phosphor powders which can be used in displays such as vacuum fluorescent display (VFD), field emission display (FED) and LED display devices, or in lighting devices such as cold cathode fluorescent lamps (CCFL) and LED lamps, or in light-emitting apparatuses such as back-lights, wherein the producing method for phosphor powders comprises the step of subjecting part or all of a metal oxide to nitriding by calcining in an atmosphere containing nitrogen, using a fine carbon substance.

The invention provides a nitride phosphor material and a preparation method thereof. The nitride phosphor material is characterized in that the general chemical formula is M2-xSi5-yZyN8:xEu, wherein M is one or a combination of two of the alkaline-earth metals including Mg, Ca, Sr and Ba, and Z is one of Al and Ge; x is not less than 0.01 and not more than 0.3; and y is not less than 0 and not more than 1.0. The nitride phosphor material has low-price synthetic raw materials, stable performance and simple synthesis technology and is suitable for industrialized volume production.

Provided is a light emitting device having excellent color reproducing performance. The light emitting device has a light emitting element, a red phosphor composed of a nitride phosphor, and a green phosphor composed of halosilicate. The emission spectrum has a first peak wavelength of 440nm or more but not more than 470nm, a second peak wavelength of 510nm or more but not more than 550nm, and a third peak wavelength of 630nm or more but not more than 670nm. The lowest relative emission strength value between the second peak wavelength and the third peak wavelength is 80% of the lower value of either the relative emission intensity value at the second peak wavelength or the relative emission intensity at the third peak wavelength or is lower than 80% of such value.

The invention discloses a packaging process for white light-emitting diodes (LEDs). The packaging process comprises the following steps of blending silica gel A, silica gel B, a brightening agent, an anti-settling agent, aluminate phosphor and nitride phosphor according to a mass proportion of 0.4:1.6:0.01:0.01:0.73:0.08 to prepare fluorescent gel, wherein the model number of the silica gel A is 1520A, and the model number of the silica gel B is 1520B; dispensing the prepared fluorescent gel into blue LED chips to be packaged, placing the blue LED chips to be packaged on the inner wall of a revolving drum of a centrifugal machine in batches, and revolving the revolving drum for 160 to 200 seconds at revolving speed of 1,800 to 2,200 revolutions per minute; and placing the centrifugally precipitated LEDs into an oven, baking the LEDs for 50 to 70 minutes at 70 to 90 DEG C, and baking the LEDs for 110 to 130 minutes at 140 to 160 DEG C. The emission wavelengths of the LED chips are matched with the excitation wavelength of the phosphor, so that an optimal color rendering property is achieved; a refractive index after the silica gel A and the silica gel B are blended can reach 1.53, so that the luminous efficiency can be improved, and radiation can be improved; a centrifugal precipitation mode is adopted, the fluorescent gel can be precipitated at the bottom of an LED support, and residual light on the lateral surfaces of the chips can be totally reflected, so that the luminous efficiency can be improved by 5 to 10 percent; and the spectroscopical BIN-based targeting rate of a centrifugal precipitation process is greatly increased.

The present invention discloses aluminum nitride microsphere powder, which has a diameter of 20 nm-10 [mu]m. According to the preparation method, a metal inorganic salt is adopted as a precursor and a sol-gel method and a gas nitriding reducing method are combined to prepare the aluminum nitride microsphere powder at the low heat treatment temperature. According to the present invention, the method has characteristics of simple preparation process, simple operation, short preparation process period, low heat treatment temperature, substantial energy consumption reducing, low raw material cost and low equipment cost, and is suitable for industrial mass production; and the prepared ALN microspheres have characteristics of regular shape, adjustable particle size, uniform size distribution, good crystallinity, high purity and the like, can be used for producing circuit packaging materials, ultraviolet photoelectric detectors, pressure sensors, thermal radiation sensors, field effect transistors, light emitting diodes, transparent ceramics, nitride phosphor and the like, and is further the material with the excellent performances such as high temperature resistance, corrosion resistance and anti-oxidation property.

To reduce impurity contents of carbon and oxygen not contributing to light emission, then suppress deterioration of emission intensity of a phosphor, and improve emission efficiency of this phosphor. Therefore, there is provided a firing method of nitride or oxynitride phosphors, wherein a crucible 11 made of nitride is used as a firing container, and firing is performed, with this crucible covered with a lid (container 10), to manufacture the phosphor. The phosphor is expressed by a general composition formula MABO_oN_3-2/3O:Z in which element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is an activating agent, satisfying o≧0.

Problem to be solved is to provide a nitride phosphor having enhanced luminance, internal quantum efficiency and external quantum efficiency compared to those of conventional nitride phosphors. The nitride phosphor is represented by the general formula (1) shown below and it is characterized in that the infrared spectroscopy measured by the diffuse reflection method at the measurement intervals of 2 cm⁻¹ or lower, satisfies predetermined conditions:

Ln_xSi_yN_n:Z  (1)

(In the general formula (1), Ln represents rare earth element excluding the element to be used as an activator, Z represents an activator, x satisfies the condition of 2.7≦x≦3.3, y satisfies the condition of 5.4≦y≦6.6, and n satisfies the condition of 10≦n≦12.)

Provided are a method for preparing a rare-earth doped alkaline-earth silicon nitride phosphor powder having the composition of Me_2-xR_xSi₅N_8-yF_3y (0<x<1.0, 0≦y<0.5) within seconds at ambient temperature; the nitride phosphor prepared therefrom; and a light emitting device comprising the phosphor.

Such silicon nitride based phosphors having small particle size, large surface area and improved chemical properties can strongly absorb UV and blue light and efficiently convert it into orange-red light, so that they can be used as an effective phosphor to form a smooth layer without sedimentation in a LED package, and as light sources and displays. Especially for applying the fine particles to a LED package, cost reduction can be achieved with respect to the weight ratio.

Provided is a sintered phosphor-composite for an LED, having high heat resistance, high thermal conductivity, high luminance, and high conversion efficacy. In addition, there are provided: a light-emitting apparatus which uses the sintered phosphor-composite; and an illumination apparatus and a vehicular headlamp which use the light-emitting apparatus. The sintered phosphor-composite includes a nitride phosphor and a fluoride inorganic binder. The sintered phosphor-composite preferably has an internal quantum efficiency of 60% or more when excited by blue light having a wavelength of 450 nm. Further, the sintered phosphor-composite preferably has a transmittance of 20% or more at a wavelength of 700 nm.

The invention relates to a nitride phosphor/glass composite optical conversion kit for laser illumination and a preparation thereof, which relates to light conversion components. Nitride phosphor/glass composite optical conversion kit for laser illumination comprises a nitride phosphor/glass composite coating and a high thermal conductivity ceramic substrate, the nitride phosphor/glass composite coating is closely grown on the high thermal conductivity ceramic substrate. The preparation of phosphor slurry: the nitride phosphor/glass composite optical conversion kit is prepared for laser illumination. The nitride phosphor/glass composite optical conversion kit can be used in laser illumination. The luminous efficiency above 280 lm/W can be obtained by coupling the provided nitride phosphor/glass composite optical conversion kit for laser illumination with a laser source with emission wavelength about 450 nanometers.

A light-emitting device includes a light-emitting element emitting primary light and a wavelength conversion portion absorbing a part of the primary light and emitting secondary light having a wavelength equal to or longer than the wavelength of the primary light. The wavelength conversion portion includes a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors. The green or yellow light-emitting phosphor is implemented by at least one selected from a specific europium (II)-activated silicate phosphor (A-1) and a specific cerium (III)-activated silicate phosphor (A-2). The red light-emitting phosphor is implemented by a specific europium (II)-activated nitride phosphor (B). The light-emitting device emitting white light at efficiency and color rendering property higher than in a conventional example can thus be provided.

Provided are a group 13 nitride phosphor having high luminous intensity and excellent reliability obtained by preparing group 13 nitride crystallites homogeneously dispersible in a solid matrix by capping surface defects and homogeneously dispersing the group 13 nitride crystallites in the solid matrix and an efficient method of preparing the same. The present invention relates to a group 13 nitride phosphor consisting of group 13 nitride crystallites having a group 13 element dispersed in a matrix of a silica gel solid layer, with a diamine compound bonded to the surfaces of the group 13 nitride crystallites and the silica gel solid layer, and a method of preparing the same.