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Phosphors of rare earth and transition metal doped Ca1+xSr1-xGayIn2-ySzSe3-zF2, methods of manufacturing and applications

一种ca1.5sr0.5ga2s3f2、过渡金属元素的技术，应用在光子能降频转换应用领域，能够解决波长转换效率低、荧光粉吸收弱等问题

Inactive Publication Date: 2015-02-04
AUTERRA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for excitation sources in the blue region of the visible spectrum (400-480nm), these phosphors have weak absorption and low wavelength conversion efficiency

Method used

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  • Phosphors of rare earth and transition metal doped Ca1+xSr1-xGayIn2-ySzSe3-zF2, methods of manufacturing and applications
  • Phosphors of rare earth and transition metal doped Ca1+xSr1-xGayIn2-ySzSe3-zF2, methods of manufacturing and applications
  • Phosphors of rare earth and transition metal doped Ca1+xSr1-xGayIn2-ySzSe3-zF2, methods of manufacturing and applications

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Experimental program
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Embodiment 1

[0047] Doped with Eu 2+ CaSrGa 2 SSe 2 f 2 Through pre-synthesized SrSe, GaSe, GaS, CaF 2 , and EuCl 3 synthesized by reaction. Each compound (SrSe, GaSe, GaS, CaF 2 ) are 1 mole. EuCl 3 The weight is 4% of the total weight of other compounds. The mixture was reacted at a temperature of 1000° C. for 2 hours in an argon atmosphere. Obtains a yellow-green glowing ingot. The ingot was rolled to a fine powder and annealed at 850° C. for an additional 30 minutes in a hydrogen atmosphere to obtain a yellow-green luminescent free-flowing powder. The powder was chemically washed in an aqueous solution containing KOH (pH in the range of 9 to 10) and then dried with nitrogen. Figure 2a The photoluminescence spectrum of the phosphor is shown in (solid line). The powder X-ray diffraction pattern (XRD) of the phosphor is illustrated in FIG. 3 . The electro-to-optical conversion efficiency of the PC-LED fabricated using the dry powder and excited by a blue LED (451 nm) was meas...

Embodiment 2

[0049] To demonstrate the peak emission tunability of the inventive alloy composition according to the element ratio, doping Eu 2+ Ca 2 Ga 2 SSe 2 f 2 By pre-synthesized CaS, GaSe, CaF 2 and EuCl 3 The opposite reaction is synthesized. CaS and CaF 2 Each compound is 1 mole. GaSe is 2 moles. EuCl 3 The weight is 4% of the total weight of other compounds. The mixture was reacted at a temperature of 1000° C. for 2 hours in an argon atmosphere. Obtains a yellow-orange glowing ingot. The ingot was rolled into a fine powder and annealed at 850° C. for an additional 30 minutes in a hydrogen atmosphere to obtain a yellow-orange glowing free-flowing powder. The powder was chemically washed in an aqueous solution containing KOH (pH in the range of 9 to 10) and then dried with nitrogen. Figure 2a The photoluminescence spectrum of the phosphor is shown in (dashed line).

Embodiment 3

[0051] Doped with Eu 2+ CaSrGa 2 S 3 f 2 Via pre-synthesized SrS:Eu 2+ , GaS and CaF 2 The opposite reaction is synthesized. SrS:Eu 2+ and CaF 2 Each is 1 mole, and GaS is 8 moles (excess). Eu 2+ The weight of is 2% of the total weight of SrS in the synthesized compound. The mixture was reacted at a temperature of 900° C. for 48 hours and then at 1050° C. for 12 hours in an argon atmosphere. The reaction mixture was slowly cooled to 950°C at a rate of 2°C per hour and then cooled to room temperature at a rate of 50°C per hour by a rapid cooling cycle. Green-emitting crystals embedded in an excess of GaS were obtained. The crystals were extracted by washing the reaction mixture with KOH-containing aqueous solution (pH in the range of 10-11) for 12 hours. This extracted crystal was crushed into a fine powder and then annealed at 900 °C for 12 h in an argon atmosphere to obtain a green luminescent free-flowing powder. In Figure 2b it is shown that the photoluminescen...

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Abstract

Energy down conversion phosphors represented by the chemical formula Ca1+xSr1−xGayIn2−ySzSe3−zF2 where (0≰x≰1, 0≰y≰2, 0≰z≰3) doped with rare earth and / or transition metal elements is disclosed. Dopant impurities may be one or more species such as Eu, Ce, Mn, Ru, and / or mixtures thereof present as activators. The molar fractions x, y and z, the dopant species and the dopant concentration may be varied to tune the peak emission wavelength and / or the width of the emission peak.

Description

Background technique [0001] The present invention relates to Ca doped with rare earth metals and / or transition metals 1+x Sr 1-x Ga y In 2-y S z Se 3-z f 2 (0≤x≤1, 0≤y≤2, 0≤z≤3) compound and its synthesis method, the compound can be used in the down-conversion of photon energy. [0002] Solid-state lighting (SSL) technology based on light-emitting diodes (LEDs) is expected to be used in many applications, including general lighting, displays, medical systems, communication systems, and more. Significant progress in the SSL industry will depend on the availability of high-efficiency, high-energy white LEDs. Currently available commercial white LEDs, especially warm white, are not adequate for most general lighting applications. Their overall light output, luminous efficiency, color performance, and lifetime must all be improved, and their cost must be reduced, so that white LEDs can be widely used in general lighting applications. Two common approaches to producing whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/08C09K11/61C09K11/62C09K11/85
CPCH05B33/14C09K11/886C09K11/7733C09K11/7791C09K11/7731
Inventor 帕尔塔·S·杜塔
Owner AUTERRA INC
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