Calcium samarium tin aluminum garnet-based orange-yellow fluorescent powder and preparation method thereof

Abstract

The invention discloses a calcium-samarium-tin-aluminum-garnet-based orange-yellow fluorescent powder and a preparation method thereof. A calcium samarium tin aluminum garnet-based orange-yellow fluorescent powder, the chemical composition expression of which is: Ca 2 SM 1‑ x sn 2 Al 3 o 12 :xTb 3+ , x is doped Tb 3+ Ion concentration, where: 0.94≤x<1. The calcium samarium tin aluminum garnet-based orange-yellow fluorescent powder proposed by the present invention can be excited by 365-385nm near-ultraviolet light, and under the excitation of ultraviolet light, it can emit light covering the range of 480-720nm and the main peaks of green light and red light are respectively at 543nm And orange-yellow fluorescence at 616nm.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a calcium-samarium-tin-aluminum-garnet-based orange-yellow fluorescent powder and a preparation method thereof. Background technique [0002] The spectral coverage of commercial yellow YAG phosphors is limited, and the lack of red light components seriously affects the performance indicators of yellow YAG phosphors in many functional devices. In common white LED devices, blue LED chips loaded with a single yellow YAG phosphor have low white light color rendering index (Ra<80) and high color temperature (CCT>6500K), which are not conducive to high-end applications. . In order to further improve the light quality of LED devices and expand their application scope, it is particularly important to develop new yellow phosphors. [0003] With the development of semiconductor chip technology, under the background of the increasingly low cost of near-ultraviolet LED ...

AI Technical Summary

Problems solved by technology

However, this approach may introduce reabsorption between phosphors and affect the overall luminous efficiency of the device. Therefore, current research tends to control the ratio of luminescent centers in a single matrix and then use co-excitation or energy transfer mechanisms to achieve effective luminescence. Spectrum regulation

[0004] In the prior art, reports on the coexistence of terbium and samarium double centers include phosphate-based phosphors Ba 3 La(PO 4 ) 3 :Tb 3+ ,Sm 3 + , Silicate-based phosphor Ba 3 MgSi 2 o 8 :Tb 3+ ,Sm 3+ etc., but their actual production and application in white LED devices is still very limited, mainly because the content of luminescent centers is not high enough, the utilization rate of excitation light in the near ultraviolet region is low, and the position of the main peak of red light is not ideal. Therefore, the new type has better performance. The search for terbium-samarium double-center phosphors still has a long way to go

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