White light-emitting device capable of regulating color temperature

A light-emitting device and color temperature technology, which is applied in the directions of luminescent materials, lighting devices, electroluminescent light sources, etc., can solve the problems of reduced brightness, difficulty in uniformly controlling the color temperature of white light, and low efficiency of red light phosphors, etc.

Inactive Publication Date: 2007-03-14
林文钦
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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 wav

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  • White light-emitting device capable of regulating color temperature
  • White light-emitting device capable of regulating color temperature
  • White light-emitting device capable of regulating color temperature

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Embodiment Construction

[0039] The present invention is to provide a white light emitting device with adjustable color temperature, which includes a first light-emitting element, which has a light-emitting layer that is a semiconductor, and emits blue light; in addition, a photoluminescent phosphor is covered on the first light-emitting element , the photoluminescent phosphor completely absorbs the light emitted by the first light-emitting element to emit green light, and the green light is mixed with blue light to form blue light; and by providing a second light-emitting element, which has a light-emitting layer of semiconductor, and emits red light; whereby this red light is mixed with cyan light to form white light. The present invention further utilizes a current adjusting device, which is electrically connected to the second light-emitting element to adjust the amount of current transmitted to the second light-emitting element, thereby achieving the purpose of adjusting the color temperature.

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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...

Claims

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Application Information

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IPC IPC(8): H05B37/02H05B33/08H05B33/12G09G5/02C09K11/06H05B44/00
CPCY02B20/181Y02B20/00
Inventor 熊麒
Owner 林文钦
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