Semiconductor light-emitting device

Abstract

The invention relates to a semiconductor light-emitting device. The semiconductor light-emitting device comprises a base, a semiconductor PN junction light-emitting chip, a fluorescent powder layer and a light transmission housing, wherein the semiconductor PN junction light-emitting chip is disposed on the base; the fluorescent powder layer is cladded at the periphery of the light-emitting chip; and the light transmission housing is covered at the periphery of the fluorescent powder layer. The semiconductor light-emitting device is characterized by further comprising an optical filter layer which is wrapped at the periphery of the fluorescent powder layer. The optical filter layer is a selective projection / reflection filter layer which can reflect short waves and project long waves, namely, the optical filter layer reflects short wavelength lights emitted by the chip and projects long wavelength lights emitted by the fluorescent powder layer. The invention has the prominent substantial characteristics that the optical filter layer is added to cut a part of blue lights, so that light oxidation pressure of blue lights to retina and photochemical injury are reduced, especially the injury to the group with pathological changes of retina is reduced; and light-emitting efficiency is improved. A reflection layer is disposed on the base, and a reflection cavity is formed between the reflection layer and the optical filter layer, so that fluorescent powder is stimulated fully.

Description

technical field [0001] The invention relates to a semiconductor light emitting device. Background technique [0002] LED is a semiconductor light-emitting device that can convert electrical energy into light energy. Compared with incandescent lamps and tungsten halogen lamps for general lighting, LED lighting is favored due to its energy saving, environmental protection, long life, fast response, resistance to switch impact, easy light distribution and many other advantages. TV backlighting gradually enters the field of general lighting. [0003] According to the research on visible light, to obtain white LEDs, at least a mixture of multiple spectra is required, such as white LEDs with two wavelengths (blue light + yellow light) or three wavelengths (blue light + green light + red light). [0004] At present, white light LEDs are mainly made by encapsulating a blue-emitting GaN chip and a phosphor layer coated above it. Under the excitation of short-wave blue light, the p...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a semiconductor light-emitting device, adding an optical filter layer, cutting off a large amount of short-wave blue light, which is beneficial to human health, and solves the problem of short-wave blue light adversely affecting the human body; at the same time, the cut-off short-wave blue light Reflection re-excites the phosphor, improves long-wavelength emission, and improves luminous efficiency

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