Negative feedback longitudinal integration white light-emitting diode without phosphor powder
A light-emitting diode, vertical integration technology, applied in electrical components, electric solid-state devices, circuits, etc., can solve the problems of high cost, variation, and small spectral coverage, and achieve the effect of reducing heat generation and current.
Inactive Publication Date: 2014-04-16
BEIJING UNIV OF TECH
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Problems solved by technology
The first method is simple and low in cost, but due to the existence of energy conversion and phosphor scattering, the energy loss of white light emitting diodes prepared in this way usually reaches 10-30%, and is limited by the life of phosphor powder, making the life of semiconductor light emitting diodes Reduced from 100,000 hours to less than 50,000 hours
The second method has high efficiency and long life because all of them are semiconductor materials. However, due to the small spectral coverage of the LEDs prepared by this method, the color rendering index of the device is relatively low, and the color changes with the spatial angle.
At the same time, since the red, green, and blue chips are made of AlGaInP material system and AlGaInN material system respectively, the temperature coefficients of various materials are different, so that the color of the three colors of chips changes with the change of temperature or the magnitude of the injected current and the length of time. The color of the white light chip prepared by this method changes with the temperature or the magnitude of the injected current and the length of time, so the control circuit is complicated and the cost is high.
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] refer to figure 1 Shown is a negative feedback vertically integrated non-phosphor powder white light-emitting diode, including a substrate 101, a metal bonding layer 102, a red light-emitting diode 103, and a first transparent positive temperature coefficient resistor 104 that are sequentially stacked vertically to emit green light. Diode 105 , second transparent PTC resistor 106 and blue light emitting diode 107 .
[0024] Specifically, the first transparent PTC resistor 104 and the second transparent PTC resistor 106 have the same structure, including a transparent conductive layer and a PTC resistor.
[0025] Further, the material form of the positive temperature coefficient resistor is solid or liquid, and the positive temperature coefficient resistor is coated above, below or uniformly mixed in the transparent conductive ...
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The invention provides a negative feedback longitudinal integration white light-emitting diode without phosphor powder, belonging to the technical field of semiconductor opto-electronics. The negative feedback longitudinal integration white light-emitting diode without the phosphor powder comprises a substrate 101, a metal bonded layer 102, a red light-emitting diode 103, a first transparent positive-temperature coefficient resistor 104, a green light-emitting diode 105, a second transparent positive-temperature coefficient resistor 106 and a blue light-emitting diode 107 which are longitudinally laminated in sequence. The negative feedback longitudinal integration white light-emitting diode without the phosphor powder can effectively reduce the complexity of a control circuit and ensure the service life of the diode.
Description
technical field [0001] The invention relates to the technical field of semiconductor optoelectronics, in particular to a negative feedback vertically integrated phosphor-free white light emitting diode. Background technique [0002] At present, in the field of semiconductor optoelectronics technology, there are two main ways to realize white light emission by using semiconductor light-emitting diodes: one is the method of coating phosphor on the surface of the semiconductor chip, and the other is the method of mixing red, green and blue light into white light. . The first method is simple and low in cost, but due to the existence of energy conversion and phosphor scattering, the energy loss of white light emitting diodes prepared in this way usually reaches 10-30%, and is limited by the life of phosphor powder, making the life of semiconductor light emitting diodes From 100,000 hours to less than 50,000 hours. The second method has high efficiency and long life because all...
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IPC IPC(8): H01L27/15
Inventor 郭霞关宝璐周弘毅苏治平沈光地
Owner BEIJING UNIV OF TECH