Phosphor-free single-chip white-light LED device with adjustable color temperature and manufacturing method thereof

Abstract

The invention provides a phosphor-free single-chip white-light LED device with an adjustable color temperature, and a manufacturing method thereof. The LED device is a Schottky barrier LED device. A transparent electrode material is used as a metal layer, an ultrathin dielectric material is used as a barrier insulating layer, and n or p-type GaN is used as an active layer. By adjusting the work function of a transparent metal layer, carriers can tunnel to the active layer in order to be combined with carriers of different energy levels to emit broad-spectrum white light. Thus, a single-chip phosphor-free white-light LED device with simple structure, an adjustable color temperature and a high color rendering property can be obtained. The white-light LED device has a small size, a long service life, good stability, high luminous efficiency, a good color rendering property, a fast response speed, and can become an important device structure of a simple single-chip white LED with high temperature operation, high stability and high performance in the future.

Description

technical field [0001] The invention relates to the field of semiconductor optoelectronic devices and their manufacture, in particular to a phosphor-free single-chip white LED device with adjustable color temperature and a manufacturing method thereof. Background technique [0002] As a next-generation general lighting source, white LEDs are energy-saving, environmentally friendly, and have a reliable lifespan. At the same time, the white LED light source for indoor lighting can be used as a communication base station for signal modulation and transmission, and for visible light communication (LiFi), which can complement the current popular WiFi communication and has great market potential. [0003] At present, from a technical point of view, there are three main methods to realize LED white light emission: one is to use RGB three-primary color multi-chip combination to emit light, and mix to form white light. The white light LED prepared by this method has the advantages of...

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Problems solved by technology

[0003] At present, from a technical point of view, there are three main methods to realize LED white light emission: one is to use RGB three-primary color multi-chip combination to emit light, and mix to form white light. The white light LED prepared by this method has the advantages of high luminous efficiency and good color rendering. , the disadvantage is that the three primary color chips emit light independently, and the light attenuation is different, which easily leads to unstable luminous color temperature. In addition, the driving voltage required by each light-emitting chip is different, the control circuit is relatively complicated, the cost is high, and it is difficult to commercialize it on a large scale; the second is Schlotter et al. The proposed method adopts LED blue light source to excite yellow phosphor, and the two wavelengths of light are mixed to form white light, which is mostly used for indicator lights and cannot be really used for lighting

The third is that Kafmann et al. proposed to use LED ultraviolet light to excite three primary color phosphors and mix them to form white light. This method is simple and has good color rendering of white light, but the disadvantages are low luminous efficiency of LED chips, easy leakage of ultraviolet light, and high color temperature of white light. , short life, and phosphors have slow response and temperature instability

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