White light-emitting device capable of regulating color temperature

Abstract

This invention relates to temperature and color adjusting light device, which comprises the following parts: one first light element with one light layer as semiconductor for blue light; one light fluorescence part to absorb first light element green lights to form grey light mixed with blue light; one second light element with one light layer of semiconductor to send red light to form white light mixed with grey light; one current adjusting device connected to the second light part to adjust and transmit to second light part to control mixture.

Description

technical field [0001] The invention relates to a white light emitting device with adjustable color temperature, which has the function of adjusting the color temperature, in particular to a white light emitting diode which can be used as an adjustable color temperature. Background technique [0002] Light-emitting diodes have attracted many people's attention because of their low-current, low-voltage drive power-saving characteristics. Especially white light emitting diodes. [0003] There are many ways to develop white light-emitting diodes, such as Nichia's use of single-crystal blue LEDs and yellow YAG phosphors coated on top of them. When the phosphor powder is excited, the yellow light produced is complementary to the blue light originally used for excitation to produce white light. As shown in Figure 1, the left side is the excitation spectrum of the blue LED, and the right side is the emission spectrum of the YAG phosphor. [0004] There are several serious proble...

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Problems solved by technology

[0006] The disadvantage of this method is that the efficiency of the red phosphor is low. In order to increase the efficiency, a high proportion and more red phosphor are required, but this leads to a decrease in brightness.

[0007] The above-mentioned methods of developing white light emitting diodes all face the problem that the color temperature of white light is not easy to be unified and difficult to control because the wavelength of blue light and the thickness of the phosphor will affect the color temperature.

Some products show colder white light, and some show warmer white light, which makes it difficult to unify products in mass production

[0008] Therefore, it can be seen from the above that the above-mentioned known white light emitting diodes obviously have inconvenience and shortcomings in actual production and control, and can be improved.

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