Mn (IV)-activated red hexafluoride light-emitting material and preparation method

A hexafluoride, red luminescence technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of high color temperature and low color rendering index

Inactive Publication Date: 2017-05-31
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently produced white LEDs are composed of blue LED chips and YAG:Ce 3+ composed of yellow phosphor, but its color rendering index ( R a ) is low and the color temperature (CCT) is high

Method used

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  • Mn (IV)-activated red hexafluoride light-emitting material and preparation method
  • Mn (IV)-activated red hexafluoride light-emitting material and preparation method
  • Mn (IV)-activated red hexafluoride light-emitting material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 0.202 g and HfO 2 Dissolve in 5ml hydrofluoric acid (40wt%), stir at room temperature for 60 minutes until the dissolution is complete, add 0.062g potassium hexafluoromanganate to this solution for 30 minutes; then add 0.304g cesium fluoride solid and continue to stir for 50 minutes. The obtained precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum drying oven for 24 hours. The orange-red powder obtained was the final product Cs 2 HfF 6 :Mn 4+ .

[0017] The XRD diffraction pattern of this phosphor is attached figure 1 As shown, the diffraction peaks of the sample are compared with the standard card JCPDS 74-0175 (Cs 2 HfF 6 ) Are completely consistent, and no diffraction peaks of any impurity phase are observed, which indicates that the samples we synthesized have a single crystal phase.

[0018] Attached figure 2 Shown are the room temperature excitation spectrum (monitoring wavelength is 631 nm) and emission...

Embodiment 2

[0022] Weigh 0.197 g and HfO 2 Dissolve in 10 ml of hydrofluoric acid (40wt%), stir for 30 minutes in a water bath at 50°C until the dissolution is complete, add 0.124g potassium hexafluoromanganate to this solution and react for 30 minutes; then add 0.456 g cesium fluoride solid Continue to stir for 60 min. The obtained precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum drying oven for 24 hours. The orange-red powder obtained was the final product Cs 2 HfF 6 :Mn 4+ .

Embodiment 3

[0024] Weigh 0.202 g and HfO 2 Dissolve in 10 ml of hydrofluoric acid (40wt%), stir for 10 minutes in a water bath at 80°C until the dissolution is complete, add 0.062g potassium hexafluoromanganate to this solution and react for 30 minutes; then add 0.608 g cesium fluoride solid Continue to stir for 60 min. The obtained precipitate was washed 3 times with anhydrous acetic acid and anhydrous methanol, and finally dried in a vacuum drying oven for 24 hours. The orange-red powder obtained was the final product Cs 2 HfF 6 :Mn 4+ .

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Abstract

The invention relates to the field of inorganic functional materials and discloses a Mn (IV)-activated red hexafluoride light-emitting material capable of being effectively excited by blue light and a preparation method of the material. The Mn (IV)-activated red hexafluoride light-emitting material capable of being effectively excited by the blue light has the chemical composition being Cs2Hf(1-x)F6:xMn<4+>, wherein x is the molar percentage coefficient of correspondingly doping Mn<4+> relative to Hf<4+>, and x is larger than 0 and smaller than or equal to 0.10. The red light-emitting material mainly emits red light at 631 nm under the excitation of the blue light and has high light emitting efficiency. The preparation method of the high-color-purity red oxyfluoride light-emitting material excited by the blue light is a liquid phase method, adopts a simple synthesis process and is suitable for large-scale industrial production.

Description

Technical field [0001] The present invention relates to a hexafluoride red luminescent material activated by Mn(IV) which can be effectively excited by blue light and a preparation method thereof. Specifically, it is a hexafluoride for blue light emitting diode (emission wavelength is about 460 nm) Red luminescent material and preparation method thereof. It belongs to the field of inorganic functional material preparation. Background technique [0002] As a new generation of lighting technology, blue GaN-based white light-emitting diode (W-LED) solid-state lighting, compared with traditional solid-state lighting technologies (incandescent lamps, fluorescent lamps), shows energy saving, low voltage and high light efficiency , Wide applicability, good stability, environmentally friendly, adjustable color and other advantages. However, the currently manufactured white LEDs are made of blue LED chips and YAG:Ce 3+ Yellow phosphor, but its color rendering index ( R a ) Is low and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
CPCC09K11/675
Inventor 汪正良危倩文王楠周强唐怀军罗利军郭俊明
Owner YUNNAN MINZU UNIV
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