Disclosed is a light emitting lamp bead, in which a blue light missing portion is effectively filled by means of a chip excitation phosphor combination having the waveband of 400 nm-415 nm, and phosphors also has strong absorption for purple light, so that a light emitting diode (LED) device having high light emitting efficiency may be obtained. For the waveband of 420 nm-460 nm, a blue phosphor also achieves emission; however, because the phosphors have broad peak emission, the intensity is weak with respect to a blue light excitation position, so that the harm of blue light is reduced.

An oxide fluorescent material comprises: at least one first element M.sup.1 selected from Li, Na, K, Rb, and Cs; at least one second element M.sup.2 selected from Mg, Ca, Sr, Ba, and Zn; at least one third element M.sup.3 selected from B, Al, Ga, In, and rare earth elements; at least one fourth element M.sup.4 selected from Si, Ti, Ge, Zr, Sn, Hf, and Pb; O; and Cr, wherein when the molar ratio of the at least one fourth element M.sup.4 in 1 mol of the composition is 5, the molar ratio of the at least one first element M.sup.1 is 0.7 or more and 1.3 or less, the molar ratio of the at least one second element M.sup.2 is 1.5 or more and 2.5 or less, the molar ratio of the at least one third element M.sup.3 is 0.7 or more and 1.3 or less, the molar ratio of oxygen is 12.9 or more and 15.1 or less, and the molar ratio of Cr is more than 0 and 0.2 or less, and wherein the oxide fluorescent material has a light emission peak wavelength in a range of 700 nm or more and 1,050 nm or less in a light emission spectrum of the oxide fluorescent material.

A light-emitting system for healthy lighting, a light bar and a light fixture, wherein they are applied to the field of lighting and can emit white light with a color temperature range of 2700 K to 6500 K. A relative spectral power of the light-emitting system is set to be ϕ (λ), and a relative spectral power distribution of a solar spectral curve corresponding to the color temperature is set to be S (λ). The white light has a first characteristic waveband, and a wavelength region of the first characteristic waveband is 380-405 nm. The white light has a second characteristic waveband, and a wavelength region of the second characteristic waveband is 415-455 nm. The white light has a third characteristic waveband, and a wavelength region of the third characteristic waveband is 465-495 nm.

A light emitting device includes a first light source containing a first light emitting element, and a second light source containing a second light emitting element and a second fluorescent material, the first light source emits light in a region that is demarcated in a chromaticity diagram of the CIE 1931 color coordinate system by a first straight line connecting a first point having x,y of 0.280,0.070 in the chromaticity coordinate and a second point having x,y of 0.280,0.500 in the chromaticity coordinate, a second straight line connecting the second point and a third point having x,y of 0.013,0.500 in the chromaticity coordinate, a purple boundary extending from the first point toward a direction in which x decreases in the chromaticity coordinate, and a spectrum locus extending from the third point toward a direction in which y decreases in the chromaticity coordinate, in a light emission spectrum, a light emission intensity ratio I.sub.PM/I.sub.PL of a light emission intensity I.sub.PM at a wavelength of 490 nm with respect to a light emission intensity I.sub.PL at a maximum light emission peak wavelength of the first light emitting element is in a range of 0.22 or more and 0.95 or less, the second light source emits light having a color deviation duv from a blackbody radiation locus in a range of −0.02 or more and 0.02 or less measured according to JIS Z8725 with a correlated color temperature in a range of 1,500 K or more and 8,000 K or less in a chromaticity diagram of the CIE 1931 color coordinate system, and the light emitting device emits mixed color light of light emitted from the first light source and light emitted from the second light source.

The present invention provides a light emitting device comprising a first light emitting portion that emits white light at a color temperature of 6000K or more and a second light emitting portion that emits white light at a color temperature of 3000K or less, which include light emitting diode chips and phosphors and are independently driven. The present invention has an advantage in that a light emitting device can be diversely applied in a desired atmosphere and use by realizing white light with different light spectrums and color temperatures. Particularly, the present invention has the effect on health by adjusting the wavelength of light or the color temperature according to the circadian rhythm of humans.

The invention relates to a conversion element comprising a wavelength-converting conversion material, a matrix material in which the conversion material is inserted, and a substrate on which the matrix material and the conversion material are directly arranged, the matrix material comprising at least one condensed sol-gel material selected from the following group: water glass, metal phosphate, aluminium phosphate, monoaluminium phosphate, modified monoaluminium phosphate, alkoxytetramethoxysilane, tetraethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, titanium alkoxide, silica sol, metal alkoxide, metal oxane or metal alkoxane, the conversion element being arranged in the beam path of a laser source, the conversion element being mounted in a mechanically immobile manner in relation to the laser source, and the radiation of the laser source being dynamically arranged in relation to the conversion element.

A light emitting diode (LED) device may include an LED die having a first surface on a substrate. A first phosphor layer may be formed on a second surface and sides of the LED die. The second surface may be opposite the first surface. A second phosphor layer may be formed on the first phosphor layer. The second phosphor layer may have a peak emission wavelength (L.sub.pk2) located between a peak emission wavelength of the LED die (L.sub.pkD) and a peak emission wavelength of the first phosphor layer (L.sub.pk2).

A dimmable light source for emitting white overall radiation may include a dimmer and a light-emitting diode. The dimmer may vary a current intensity of a current for operating the light-emitting diode during the operation of the light source. The LED may include a semiconductor layer sequence to emit primary radiation, and the LED may further include a conversion element configured to at least partially convert the primary radiation into secondary radiation having a first emission band with a first emission maximum ranging from 400 nm to 500 nm and a second emission band with a second emission maximum ranging from 510 nm to 700 nm. A relative intensity of the first emission band may reduce with decreasing current intensity of the current for operating the LED, and a relative intensity of the second emission band may increase with decreasing current intensity of the current for operating the LED.

The invention relates to a conversion element comprising a wavelength-converting conversion material, a matrix material in which the conversion material is inserted, and a substrate on which the matrix material and the conversion material are directly arranged, the matrix material comprising at least one condensed sol-gel material selected from the following group: water glass, metal phosphate, aluminium phosphate, monoaluminium phosphate, modified monoaluminium phosphate, alkoxytetramethoxysilane, tetraethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, titanium alkoxide, silica sol, metal alkoxide, metal oxane or metal alkoxane, the conversion element being arranged in the beam path of a laser source, the conversion element being mounted in a mechanically immobile manner in relation to the laser source, and the radiation of the laser source being dynamically arranged in relation to the conversion element.

A light emitting device includes a light emitting element, and a fluorescent member including a phosphor. The light emitting device satisfies any of Condition (A): a correlated color temperature of light emission of the light emitting device is within a range of 4500 K or more and 7500 K or less, a content of a first phosphor is within a range of 29 mass % or more and 90 mass % or less, and a melanopic ratio is within a range of 1.0 or more and 1.4 or less; Condition (B): a correlated color temperature of light emission of the light emitting device is within a range of 2500 K or more and less than 4500 K, a content of a first phosphor is within a range of 25 mass % or more and 90 mass % or less, and a melanopic ratio is within a range of 0.7 or more and 1.1 or less; and Condition (C): a correlated color temperature of light emission of the light emitting device is within a range of 2500 K or more and 3000 K or less, a content of a first phosphor is within a range of 20 mass % or more and 90 mass % or less, and a melanopic ratio is within a range of 0.48 or more and 1.10 or less.