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Transparent glass ceramic with tunable light emitting colors and preparation technique thereof

A technology of transparent glass and ceramics, applied in the field of rare earth-doped transparent glass ceramics and its preparation technology, can solve the problems of shortened service life of white light LED devices, achieve good mechanical properties and thermal stability, simple preparation process, and low cost Effect

Inactive Publication Date: 2011-06-15
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this technology can basically avoid chromatic aberration, but because the epoxy resin will age under long-term exposure to ultraviolet light, the service life of white LED devices will be shortened

Method used

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  • Transparent glass ceramic with tunable light emitting colors and preparation technique thereof
  • Transparent glass ceramic with tunable light emitting colors and preparation technique thereof
  • Transparent glass ceramic with tunable light emitting colors and preparation technique thereof

Examples

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Effect test

example 1

[0031] Example 1: Analytical pure SiO 2 、Al 2 o 3 , NaF, LaF 3 and EuF with a purity of 99.99% 3 Powder, according to 0.02EuF 3 : 11LaF 3 : 44SiO 2 : 28Al 2 o 3 : 17NaF (molar ratio) is accurately weighed and placed in an agate mortar, ground for more than half an hour to make it evenly mixed; then placed in a platinum crucible, heated to 1450 °C in a high-temperature box-type resistance furnace with program temperature control ℃, after holding for 5 hours, quickly pour the melt into a copper mold to form a precursor glass; put the precursor glass into a resistance furnace, anneal at 600℃ for 2 hours and then cool with the furnace to eliminate internal stress. According to the results of differential thermal analysis (such as figure 2 shown), the annealed glass was kept at 690°C for 6 hours to obtain transparent glass ceramics through crystallization (such as image 3 Inset); X-ray powder diffraction results (such as image 3 shown) shows that LaF with hexagonal st...

example 2

[0034] Example 2: Analytical pure SiO 2 、Al 2 o 3 , NaF, LaF 3 and EuF with a purity of 99.99% 3 Powder, according to 0.05EuF 3 : 11LaF 3 : 40SiO 2 : 30Al 2 o 3 : 19NaF (molar ratio) is accurately weighed and placed in an agate mortar, ground for more than half an hour to make it evenly mixed; then placed in a platinum crucible, heated to 1400 °C in a high-temperature box-type resistance furnace with program temperature control ℃, after holding for 1 hour, quickly pour the melt into a copper mold to form a precursor glass; put the precursor glass into a resistance furnace, anneal at 550℃ for 2 hours and then cool with the furnace to eliminate internal stress. According to the results of differential thermal analysis, the annealed glass was kept at 650°C for 6 hours to obtain transparent glass ceramics through crystallization; X-ray powder diffraction results showed that LaF with hexagonal structure was precipitated in the glass. 3 crystal phase; observation by transmi...

example 3

[0036] Example 3: Analytical pure SiO 2 、Al 2 o 3 , NaF, LaF 3 and EuF with a purity of 99.99% 3 Powder, according to 0.05EuF 3 : 9LaF 3 : 44SiO 2 : 28Al 2 o 3 : 19NaF (molar ratio) is accurately weighed and placed in an agate mortar, ground for more than half an hour to make it evenly mixed; then placed in a platinum crucible, heated to 1500 ℃ in a high-temperature box-type resistance furnace with program temperature control ℃, after holding for 1 hour, quickly pour the melt into a copper mold to form a precursor glass; put the precursor glass into a resistance furnace, anneal at 550℃ for 2 hours and then cool with the furnace to eliminate internal stress. According to the results of differential thermal analysis, the annealed glass was kept at 700°C for 4 hours to obtain transparent glass ceramics through crystallization; X-ray powder diffraction results showed that LaF with hexagonal structure was precipitated in the glass. 3 crystal phase; observation by transmiss...

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Abstract

The invention discloses a transparent glass ceramic with tunable light emitting colors and a preparation technique thereof. The glass ceramic comprises the following components: 40 to 60mol% of SiO2, 10 to 30mol% of Al2O3, 5 to 25mol% of NaF, 8 to 15mol% of LaF3, 0.005 to 1mol% of EuF3, less than 0.02% of MSO4 and less than 0.02% of Fe, wherein M represents Mg or Ca or Ba or Sr. The preparation technique for the glass ceramic comprises two steps of melt quenching preparation of precursor glass and subsequent crystallization treatment of the precursor glass. By regulating the components of the glass ceramic and controlling the crystallization behaviors of LaFe nano crystal, the glass ceramic can emit color tunable visible light comprising white light under the excitation of ultraviolet. The material is expected to replace the conventional fluorescent powder to construct a novel white light emitting diode (LED) device with stable light color and long service life, or developed into novel solid three-dimensional light display and backlight materials.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to rare earth-doped transparent glass ceramics with tunable luminous color and a preparation process thereof. technical background [0002] Solid-state lighting, especially solid white lighting, has the characteristics of power saving, no pollution, and long life. It is a new generation of semiconductor light sources that replace traditional incandescent and fluorescent lamps. Currently common commercial white LEDs are made of blue GaN chips and Ce-doped 3+ It is made of yttrium aluminum garnet (YAG) phosphor powder packaged together, and the phosphor powder is mixed in epoxy resin and coated on the chip. Part of the blue light emitted by the GaN chip is absorbed by the phosphor, causing it to be excited to emit yellow light, and the unabsorbed blue light is mixed with the yellow light emitted by the phosphor to obtain white light. Because the luminous life of the blue l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/16C03B32/02
Inventor 黄萍陈大钦王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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