LIGHT-EMITTING DEVICE, DEVICE AND METHOD FOR ADJUSTING THE LIGHT EMISSION OF A LIGHT-EMITTING DIODE
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Abstract
Light-emitting device (100) comprising:
- a light-emitting diode (102) comprising:
- an emitting layer comprising a ternary or quaternary semiconductor including a chemical element from column 13 of the periodic table of elements, among Al, Ga and In, of which the atomic composition varies over the thickness of the emitting layer, and/or
- at least two emitting layers each comprising such a semiconductor, the atomic compositions of said element being different from one layer to another,
- a device (108) that detects a wavelength and an intensity of a light emitted by the diode,
- a switched-mode electric power supply (110) able to power the diode with a periodic signal comprising a duty cycle α,
- a device (111) for controlling the switched-mode electric power supply which can alter α and a peak value of the periodic signal according to the values detected and target values.
- a light-emitting diode (102) comprising:
27 Citations
31 Claims
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1-14. -14. (canceled)
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15. A light-emitting device comprising at least:
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a light-emitting diode comprising at least one emitting layer able to form a quantum well and comprising a ternary or quaternary semiconductor including at least one chemical element from column 13 of the periodic table of elements among Al, Ga and in of which the atomic composition varies over the thickness of said at least one emitting layer, a detector of the value of a wavelength and of an intensity of a light intended to be emitted by the light-emitting diode, a switched-mode electric power supply able to electrically power the light-emitting diode with a periodic signal comprising a duty cycle α
such that α
ε
]0;
1],a controller of the switched-mode electric power supply which can alter a peak value and the duty cycle α
of the periodic signal respectively according to values of the wavelength and of the intensity of the light intended to be detected and according to the target values of the wavelength and of the intensity. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A device for adjusting a wavelength and an intensity of a light intended to be emitted by a light-emitting diode comprising at least one emitting layer able to form a quantum well and comprising at least one ternary or quaternary semiconductor comprising at least one chemical element from column 13 of the periodic table of elements among Al, Ga and In of which the atomic composition varies along the thickness of said at least one emitting layer, wherein said device for adjusting comprises at least:
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a detector of the value of the wavelength and of the intensity of a light intended to be emitted by the light-emitting diode, a switched-mode electric power supply able to electrically power the light-emitting diode with a periodic signal comprising a duty cycle α
such that α
ε
]0;
1],a controller of the switched-mode electric power supply which can alter a peak value and the duty cycle α
of the periodic signal respectively according to values of the wavelength and of the intensity of the light intended to be detected and according to the target values of the wavelength and of the intensity.
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31. A method for adjusting a wavelength and an intensity of a light intended to be emitted by a light-emitting diode comprising at least one emitting layer able to form a quantum well and comprising a ternary or quaternary semiconductor comprising at least one chemical element from column 13 of the periodic table of elements among Al, Ga and In of which the atomic composition varies along the thickness of said at least one emitting layer, wherein the method comprises at least the following steps:
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detecting the value of the wavelength and of the intensity of a emitted by the light-emitting diode, adjusting a peak value and a duty cycle α
such as α
ε
]0;
1], of a periodic signal electrically powering the light-emitting diode, respectively according to the values of the wavelength and of the intensity of the light detected and according to the target values of the wavelength and of the intensity,wherein these steps are repeated iteratively until the values of the wavelength and of the intensity of the light detected are substantially equal to the target values of the wavelength and of the intensity.
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Specification