摘要:
A method of fabricating a light emitting device (LED) includes measuring emission characteristics for a plurality of LED chips configured to emit light of a first color. The plurality of LED chips are sorted based on the measured emission characteristics to provide a plurality of groups respectively including ones of the plurality of LED chips having similar measured emission characteristics. A respective light conversion material is selected for each of the plurality of groups based on the measured emission characteristics of the ones of the plurality of LED chips included therein and a desired color point. The selected light conversion material is configured to absorb at least some of the light of the first color and responsively emit light of a second color. For each of the plurality of groups, the respective selected light conversion material is deposited on the ones of the LED chips included therein to provide a plurality of packaged LEDs including the plurality of LED chips and respectively configured to emit light having the desired color point. Related apparatus is also discussed.
摘要:
A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
摘要:
Compounds of the following Formula may be useful as phosphors in solid state light emitting devices: AaBbCcDdEe, wherein A includes calcium (Ca), strontium (Sr), barium (Ba), magnesium (Mg), yttrium (Y), hafnium (Hf), the lanthanide elements and/or the other alkaline earth (Group IIA) metals; B includes Eu2+ and Ce3+; C includes at least one tetrahedrally-coordinated trivalent element; D includes at least one tetrahedrally-coordinated tetravalent element; E includes N, O, F, C, S, Cl, Br and/or I, wherein a+b=1, c+d=2, and wherein the compound has a CaAlSiN3-type crystal structure. Light emitting devices including such phosphors may emit warm white light.
摘要翻译:其中A包括钙(Ca),锶(Sr),钡(Ba),镁(Mg),钇(Y),铪(Hf)等的固体发光器件中的磷光体。 ),镧系元素和/或其它碱土金属(IIA族)金属; B包括Eu2 +和Ce3 +; C包括至少一个四面体配位的三价元素; D包括至少一个四面体配位的四价元素; E包括N,O,F,C,S,Cl,Br和/或I,其中a + b = 1,c + d = 2,并且其中所述化合物具有CaAlSiN 3型晶体结构。 包括这种荧光体的发光器件可以发出暖白光。
摘要:
Compounds of Formula I, which include both cerium and europium, may be useful as phosphors in solid state light emitting devices. Light emitting devices including such phosphors may emit warm white light.
摘要:
A packaged light emitting device (LED) includes an LED chip configured to emit light within a first wavelength range, and a wavelength conversion material on the LED chip. The wavelength conversion material is configured to receive the light within the first wavelength range and responsively emit light within a second wavelength range different than the first wavelength range such that a light output of the packaged LED does not substantially include the light within the first wavelength range and provides an appearance of substantially monochromatic light of a color of the visible spectrum corresponding to the second wavelength range. The packaged LED may include a color filter on the wavelength conversion material that is configured to prevent passage of the light within the first wavelength range therethrough, and/or may include a thickness of the wavelength conversion material configured to completely absorb the light within the first wavelength range.
摘要:
A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
摘要:
Compounds of Formula I, which include both cerium and europium, may be useful as phosphors in solid state light emitting devices. Light emitting devices including such phosphors may emit warm white light.
摘要:
A solid state lighting apparatus includes a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED. Chromaticities of the first and second LEDs are selected so that a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity. The first LED may include a first LED chip that emits light in the blue portion of the visible spectrum and a phosphor that emits red light in response to blue light emitted by the first LED chip. The second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram, and in particular may have a yellow green, greenish yellow or green hue.
摘要:
Compounds of Formula I, which include both cerium and europium, may be useful as phosphors in solid state light emitting devices. Light emitting devices including such phosphors may emit warm white light.
摘要:
A method of fabricating a light emitting device (LED) includes measuring emission characteristics for a plurality of LED chips configured to emit light of a first color. The plurality of LED chips are sorted based on the measured emission characteristics to provide a plurality of groups respectively including ones of the plurality of LED chips having similar measured emission characteristics. A respective light conversion material is selected for each of the plurality of groups based on the measured emission characteristics of the ones of the plurality of LED chips included therein and a desired color point. The selected light conversion material is configured to absorb at least some of the light of the first color and responsively emit light of a second color. For each of the plurality of groups, the respective selected light conversion material is deposited on the ones of the LED chips included therein to provide a plurality of packaged LEDs including the plurality of LED chips and respectively configured to emit light having the desired color point. Related apparatus is also discussed.