White light luminous device

Abstract

This invention relates to a white light emitting device including a semiconductor emitting chip, a blue-green photoluminescence phosphor and a red photoluminescence phosphor, the two phosphors absorb light emitted by the light emitting semiconductor chip to excite blue-green and red light to be mixed to get the white light.

Description

technical field [0001] The invention relates to a white light emitting device, in particular to a white light emitting device in which two kinds of photoluminescent phosphors absorb light from a semiconductor light emitting chip and excite the light, which are mixed with each other to form white light. Background technique [0002] White light is a multi-color mixed light that can be perceived as white light by the human eye, including at least two or more wavelengths. For example, when the human eye is stimulated by red, blue, and green light at the same time, or when it is stimulated by blue light and yellow light at the same time, it can feel white light. Therefore, LED light sources that emit white light can be produced based on this principle. There are four common manufacturing methods for white light LEDs: the first method is to use three LEDs made of InGaAlP, GaN and GaN, and control the current passing through the LEDs to emit red, green and blue light respectively....

AI Technical Summary

Problems solved by technology

But its disadvantage is that the luminous efficiency is only 8lm / W, and the lifespan is only 8000 hours. It still needs to make further breakthroughs in terms of practical efficiency.

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