19-04-2018 дата публикации
Номер: US20180108816A1
Принадлежит:
A semiconductor light emitting device includes an LED and an associated recipient luminophoric medium that includes respective first through fourth luminescent materials that down-convert respective first through fourth portions of the radiation emitted by the LED to radiation having respective first through fourth peak wavelengths. The first peak wavelength is in the green color range and the second through fourth peak wavelengths are in the red color range. The second and third luminescent materials each emit light having a full-width half maximum bandwidth of at least 70 nanometers, while the fourth luminescent material emits light having a full-width half maximum bandwidth of less than 60 nanometers. Embodiments that only include three luminescent materials are also disclosed. 1. A method of manufacturing a semiconductor light emitting device , comprising: [{'sub': 2', '2, 'dissolving MOpowder in a first hydrofluoric acid (HF) solution to provide an MO+HF solution, where M is one or more of Si, Ge, Sn, Ti, Zr or Hf;'}, {'sub': 2', '6', '2', '2', '6', '2, 'adding dissolved AMnFto the MO+HF solution to provide a AMnF+MO+HF solution, where A is an Alkali metal;'}, {'sub': 2', '2, 'dissolving AHFin a second hydrofluoric acid solution to provide an AHF+HF solution;'}, {'sub': 2', '2', '6', '2, 'adding the AHF+HF solution to the AMnF+MO+HF solution;'}, {'sub': 2', '6', '2', '2', '6', '2, 'sup': '4+', 'extracting solid precipitates of AMF:Mn from the combination of the AHF+HF and the AMnF+MO+HF solutions;'}], 'synthesizing a narrow-spectrum phosphor byproviding a light emitting diode (“LED”); and a first luminescent material that down-converts a first portion of the radiation emitted by the LED to radiation having a first peak wavelength in the green color range;', 'a second luminescent material that down-converts a second portion of the radiation emitted by the LED to radiation having a second peak wavelength in the red color range, the second luminescent material ...
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