Abstract: A light emitting device includes: a die-mounting base having a mounting surface; a light emitting diode mounted on the mounting surface of the die-mounting base and having a top surface facing in a normal direction normal to the mounting surface of the die-mounting base; a first wavelength-converting layer of a first wavelength-converting material formed on the mounting surface of the die-mounting base, enclosing the light emitting diode, and having a top surface; and a second wavelength-converting layer of a second wavelength-converting material formed on the top surface of the first wavelength-converting layer and having a top surface that is aligned with the top surface of the light emitting diode in the normal direction, and that has an area smaller than the top surface of the first wavelength-converting layer and not smaller than the top surface of the light emitting diode.

Abstract: A light emitting device includes: a die-mounting base having a mounting surface; a light emitting diode mounted on the mounting surface of the die-mounting base and having a top surface facing in a normal direction normal to the mounting surface of the die-mounting base; a first wavelength-converting layer of a first wavelength-converting material formed on the mounting surface of the die-mounting base, enclosing the light emitting diode, and having a top surface; and a second wavelength-converting layer of a second wavelength-converting material formed on the top surface of the first wavelength-converting layer and having a top surface that is aligned with the top surface of the light emitting diode in the normal direction, and that has an area smaller than the top surface of the first wavelength-converting layer and not smaller than the top surface of the light emitting diode.

Abstract: A compound represented by the following formula: SrxMyAlzSi12?zN16?zO2+z wherein, M is selected from the group consisting of rare earth elements and yttrium, x>0, y>0, x+y=2, and 0?z?5. The compound may be used as a phosphor. It emits a visible light upon being excited by a blue light and/or an ultra-violet light. When M is Eu, the compound emits a yellow-green light upon being excited by a blue light and/or an ultra-violet light.

Abstract: A white light-emitting device has a semiconductor light-emitting chip, configured to emit light and at least one (Ba1?xMx)Al2O4 phosphor to absorb the light emitted from the semiconductor light-emitting chip to emit a white light, where M is consisted of at least one of Eu, Bi, Mn, Ce, Tb, Gd, La, Mg and Sr, 1>x>0.

Abstract: A white light-emitting device has a semiconductor light-emitting chip, configured to emit light and at least one (Ba1-xMx)Al2O4 phosphor to absorb the light emitted from the semiconductor light-emitting chip to emit a white light, where M is consisted of at least one of Eu, Bi, Mn, Ce, Tb, Gd, La, Mg and Sr, 1>x>0.

Abstract: A white light-emitting device has a semiconductor light-emitting chip, a blue-green phosphor and a red phosphor for emitting blue-green light and red light, respectively. The blue-green phosphor and the red phosphor absorb light emitted from the semiconductor light-emitting chip to excite blue-green light and red light that are mixed into white light with improved illumination efficiency, and a high color-rendering property. The white light-emitting device is cheaply and simply manufactured.

Abstract: A white light-emitting device comprising a blue-violet or blue LED and a phosphor material capable of emitting a yellow-green to orange-yellow light upon excitation by the light emitted by the LED. The light from the LED and the phosphor material are mixed in an appropriate ratio to produce a white light. The phosphor material has a general formula (YxMyCez)Al5O12, where x+y=3, x, y?0, 0.5>z>0, and M is selected from the group consisting of Tb, Lu, and Yb, with (YxMy)Al5O12 serving as a host and Ce as an activator. By changing the composition of the metal elements in the host, the crystal field is modulated to thereby alter the energy level of the excited state to which the activator is transferred upon irradiation by a specific wavelength of light, leading to the change in the emitting wavelength of the phosphor material.

Abstract: A yellow phosphor material has a host with a formula (TbxMyCez)Al5O12, wherein x+y+z=3 , 3>x>0 and y?0 and a Ce activator. M is selected from the group consisting of Sc, Y, Dy, Ho, Er, Tm, Yb, and Lu. By changing the diameter of metal ions, the crystal field thereof may be modulated to thereby alter the energy level of the excited state to which the activator is transferred upon irradiation by a specific wavelength of light. The phosphor can be used with a blue LED to form a white light source.

Abstract: A method for manufacturing white light source includes the steps of providing an ultra-violet light as radiation source; and preparing two kinds of phosphors each receiving the ultra-violet light and emitting light of different wavelength. One phosphor is designated to emit light covering two wavelength regimes of three primitive colors, i.e., red light (585-640 nm), green light (500-570 nm) and blue light (430-490 nm), and another phosphor is designated to emit light covering remaining wavelength regime of the three primitive colors. The phosphors are mixed in predetermined ratio such that the lights of different wavelength are combined to provide a white light.

Abstract: A fluorescent material with formula(YxMyCez)Al5O12, where x+y=3, x, y≠0, 0<z<0.5, M is selected from the group consisting of Tb, Lu, and Yb. The fluorescent material has a host (YxMy)Al5O12 and an activator: Ce. By changing the composition of metals in the host, the crystal field thereof can be modulated, thereby altering the interaction force between the activator and the other components, and changing the wavelength of emitted colors. The present invention provides a white light-emitting device comprising a light emitting diode and above-mentioned fluorescent powder. The LED emits purple-blue or blue light having a domination wavelength AD range from 430 nm to 500 nm. The fluorescent powder is excited by the purple-blue or blue light emitted from the LED to generate green-yellow light to orange-yellow light having a wavelength range from 560 nm to 590 nm and mixed with the light of LED to form white light.

Abstract: A fluorescent material with formula(YxMyCez)Al5O12, where x+y=3, x, y≠0, 0<z<0.5, M is selected from the group consisting of Tb, Lu, and Yb. The fluorescent material has a host (YxMy)Al5O12 and an activator: Ce. By changing the composition of metals in the host, the crystal field thereof can be modulated, thereby altering the interaction force between the activator and the other components, and changing the wavelength of emitted colors. The present invention provides a white light-emitting device comprising a light emitting diode and above-mentioned. fluorescent powder. The LED emits purple-blue or blue light having a domination wavelength &lgr;D range from 430 nm to 500 nm. The fluorescent powder is excited by the purple-blue or blue. light emitted from-the LED to generate green-yellow light to orange-yellow light having a wavelength range from 560 nm to 590 nm and mixed with the light of LED to form white light.

Abstract: A method for manufacturing white light source includes the steps of providing an ultra-violet light as radiation source; and preparing two kinds of phosphors each receiving the ultra-violet light and emitting light of different wavelength. One phosphor is designated to emit light covering two wavelength regimes of three primitive colors, i.e., red light (585-640 nm), green light (500-570 nm) and blue light (430-490 nm), and another phosphor is designated to emit light covering remaining wavelength regime of the three primitive colors. The phosphors are mixed in predetermined ratio such that the lights of different wavelength are combined to provide a white light.