Upconversion luminescent material

A fluorescent material and optical technology, applied in the field of fluorescent materials, can solve the problems of limited infrared light absorption and low efficiency, and achieve the effects of wide application prospects, improved luminous efficiency, and enhanced conversion efficiency

Inactive Publication Date: 2009-01-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In rare earth single-doped materials, since the f-f forbidden transition of rare earth ions is used, the spectrum of narrow-line oscillators with low intensity limits the absorption of infrared light, so the efficiency of this type of material is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Transparent borosilicate glass-ceramic contains rare earth ions Eu 3+ and second-order nonlinear optical crystallite β-BaB 2 o 4 (average size: 10nm), Eu 3+ The molar concentration of ions in borosilicate glass is 0.001%, β-BaB 2 o 4 The volume percentage in borosilicate glass is 25%. Irradiated with a focused 800nm ​​femtosecond laser, this example contains β-BaB 2 o 4 Nanocrystalline Eu 3+ The upconversion luminescence intensity at 615nm of doped transparent borosilicate glass-ceramics is higher than that without β-BaB 2 o 4 Crystalline glass is 12.2 times larger.

Embodiment 2

[0022] Rare earth ions Sm contained in transparent silicate glass-ceramics 3+ and the second-order nonlinear optical crystallite Ba 2 TiSi 2 o 8 (average size: 100nm), Sm 3+ The molar concentration of ions in silicate glass is 0.5%, Ba 2 TiSi 2 o 8 The volume percentage in silicate glass is 50%. Irradiated with a focused 800nm ​​femtosecond laser, this example contains Ba 2 TiSi 2 o 8 Nanocrystalline Sm 3+ The up-conversion luminous intensity of doped transparent silicate glass-ceramic at 602nm is higher than that without Ba 2 TiSi 2 o 8 Crystalline glass is 18.8 times larger.

Embodiment 3

[0024] Rare earth ion Ce contained in transparent borate glass-ceramics 3+ and second-order nonlinear optical microcrystalline LiB 3 o 5 (average size: 20nm), Ce 3+ ions at a molar concentration of 0.1% in borate glass, LiB 3 o 5 The volume percentage in borate glass is 0.1%. Irradiated with a focused 800nm ​​femtosecond laser, this example contains LiB 3 o 5 Nanocrystalline Ce 3+ The upconversion luminescence intensity at 420nm of doped transparent borate glass-ceramics is higher than that without LiB 3 o 5Crystalline glass is 1.6 times larger.

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PUM

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Abstract

An up-conversion fluorescent material disclosed by the invention contains rare earth ion and second-order nonlinear optical microlite with the scale of nanometer or micron in glass matrix, wherein, the molar concentration of the rare earth ion is 0.001-5 percent in the glass matrix, and the volume percent of the second-order nonlinear optical microlite is 0.1-50 percent in the glass matrix. The rare earth ion can absorb Lambada/2 wavelength but not Lambada wavelength. A microcrystalline glass sample is focused by the laser of Lambada wavelength to produce ray rare earth ion of Lambada/2 wavelength and produce visible light emitting through reabsorption. As the conversion efficiency of frequency multiplication is a plurality of orders of magnitude higher than multiphoton absorption up-conversion efficiency, the up-conversion efficiency is obviously increased. The up-conversion fluorescent material has broad application prospect in the fields of biomarkers and three-dimensional display, etc.

Description

technical field [0001] The present invention relates to fluorescent materials, especially up-converting fluorescent materials. Background technique [0002] An up-conversion material is a fluorescent material that emits visible light when excited by infrared light, that is, a material that converts infrared light into visible light. It is characterized in that the absorbed photon energy is lower than the emitted photon energy. This phenomenon violates Stokes' law, so it is also called anti-Stokes' law luminescent material. [0003] The up-conversion effect makes infrared light invisible to the human eye into visible light (mainly the conversion of near-infrared light). This feature is of great significance to the development of infrared detection technology. As a display material for infrared light, up-conversion materials have reached the practical level, such as military night vision goggle materials, infrared quantum counters or light-emitting diode materials, which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79C09K11/78C09K11/81
Inventor 朱斌邱建荣张松敏周时凤
Owner ZHEJIANG UNIV
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