Light emitting devices having closely-spaced broad-spectrum and narrow-spectrum luminescent materials and related methods
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United States of America Patent
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Jan 16, 2018
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app pub date -
Jun 16, 2016
filing date -
Jun 18, 2015
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Abstract
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.
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