A method for manufacturing a single-chip white light LED based on a lithium aluminate substrate and a structure thereof

Abstract

The invention relates to a method for manufacturing a single-chip white light LED based on a lithium aluminate substrate. A femtosecond laser is used to etch nano-sized grooves according to regions in the lithium aluminate substrate to form patterned nanostructures. The grooves with different depths were etched in each region, and then InGaN / GaN quantum wells are grown on the structure. Different areas can emit different wavelengths of light, and the recombination of the light generates white light. No phosphor needs to be coated on the surface of the single-chip LED, and white light emission can be realized just by the luminescence of the single chip itself, so that the cost can be substantially reduced.

Description

technical field [0001] The invention relates to an LED lighting technology, in particular to a method for preparing a single-chip white light LED. Background technique [0002] White light-emitting diodes (LEDs) are widely used as a new generation of light sources in the fields of lighting, displays, and car lights because of their advantages such as energy saving, environmental protection, and long life. At present, commercial white LED light source packages mainly use blue LED chips covered with phosphor. This kind of blue light chip has a narrow emission band, and the short-wavelength blue light generated by the composite LED substrate and the long-wavelength yellow light emitted by the phosphor powder are used to obtain broadband white light emission. The encapsulation process is that silica gel mixed with fluorescent powder is bonded on the blue light chip. However, silica gel is an organic matter, its Tg (glass transition temperature) is only about 150°C and its ther...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for preparing a single-chip white light LED based on a lithium aluminate substrate, in order to solve the problem that traditional LED lamps need to use phosphor powder, and multi-crystal LEDs are complicated to emit light, resulting in high cost. In order to solve the above problems, The present invention adopts following technical scheme:

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