Wavelength conversion apparatus and luminous apparatus

Abstract

The invention provides a wavelength conversion apparatus and a luminous apparatus. The wavelength conversion apparatus comprises an actuating device which is fixedly connected with a fluorescent material layer and is used to drive the fluorescent material layer to form periodic relative motion with excitation light. A molecular formula of a fluorescent material in the fluorescent material layer is (YLLumGdnTb3-L-m_n)Al5O12:Ce, or Y3(AlyGa5-y)O12:Ce or (YYLLumGdnTb3-L-m-n)(AlyGa5-y)O12:Ce, wherein the L, the m, the n and the y are real numbers which are greater than or equal to 0 and satisfy that: L+m is greater than or equal to 0 and is less than 3; L+m+n is greater than or equal to 0 and less than or equal to 3; the y is less than 5. A dominant wavelength of an emission spectrum of the fluorescent material is larger than the dominant wavelength of the emission spectrum of the fluorescent material whose molecular formula is Y3Al5O12:Ce under a same excitation condition. A proportion of a diameter of a light spot generated through irradiating on the fluorescent material layer by the excitation light to a track length of the excitation light which carries out relative motion for one period on the fluorescent material layer is less than 3%. In the wavelength conversion apparatus and the luminous apparatus of the invention, through using a modified YAG phosphor powder and the relative motion between the phosphor powder and the excitation light, luminous brightness of red light can be greatly increased.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a wavelength conversion device and a light emitting device. Background technique [0002] At present, solid-state light sources based on wavelength conversion are becoming more and more research and application hotspots. For example, white light sources produced by using blue light-emitting diodes (LEDs, light emitting diodes) to excite yellow phosphors have been widely accepted and used. [0003] Different from general lighting, in the field of projection display, in order to obtain color images, monochrome sequential light sources are generally used as lighting sources. One method is to use multiple filters to filter white light in turn to obtain monochromatic light, but the efficiency of the filtering process is very low; the other method is to directly use monochromatic wavelength conversion materials to obtain monochromatic light, such as using green phosphors Stimulated t...

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Problems solved by technology

One method is to use multiple filters to filter white light in turn to obtain monochromatic light, but the efficiency of the filtering process is very low; the other method is to directly use monochromatic wavelength conversion materials to obtain monochromatic light, such as using green phosphors Stimulated to produce green light

The efficiency of the second method is significantly improved compared with the first method, but the problem is that the efficiency of the red phosphor is too low, and the service life is too short, which makes red light become the bottleneck of the efficiency and life of the entire light source system

[0009] Other modifications also have similar effects, such as replacing the Y element in the YAG lattice with Gd element, or replacing the Al element in the YAG lattice with Ga element, which will increase the dominant wavelength of the emission spectrum of the phosphor, but At the same time, it will also cause a decrease in its temperature stability, and the larger the dominant wavelength, the more severe the decrease in temperature stability

Although replacing the Y element in the YAG lattice with Lu elements will not cause a decrease in temperature stability, it will also reduce the dominant wavelength of the emission spectrum of the phosphor and reduce the energy distribution of the red spectral components.

[0010] Through experiments, we also tried to use two or more replacement elements at the same time, for example (Y 1 Gd 1 Tb 1 )(Al 4 Ga 1 )O 12 :Ce, even replace elements in the original YAG lattice with replacement elements, for example (Tb 2 Gd 1 ) Ga 5 o 12 : Ce, but still can not solve the contradiction between the increase of the dominant wavelength of the emission spectrum and the thermal stability

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