Red fluorescent substance and method for production thereof

A red fluorescent material technology, applied in the field of red fluorescent material, can solve the problems of long decay time and achieve the effects of high emission efficiency, short fluorescence lifetime, and high emission intensity

Inactive Publication Date: 2018-04-24
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This decay time is much longer than that of commonly used phosphors, which is undesirable for display devices designed for high-speed high-definition rendering

Method used

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  • Red fluorescent substance and method for production thereof
  • Red fluorescent substance and method for production thereof
  • Red fluorescent substance and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0088] Hereinafter, the present invention will be described in more detail based on Examples and Reference Examples, which are not intended to limit the scope thereof.

reference example 1

[0090] (Preparation K 2 MnF 6 )

[0091] K 2 MnF 6 sample.

[0092] A polyvinyl chloride resin reaction vessel was prepared having two chambers separated by an ion exchange membrane of fluoroplastic placed in the center of the vessel, wherein each chamber was provided with an anode and a cathode, both of which were made of platinum plates. One chamber with the anode is filled with an aqueous solution of hydrofluoric acid containing manganese(II) fluoride dissolved therein. Another chamber with a cathode is filled with an aqueous solution of hydrofluoric acid. Both electrodes were connected to a power supply, and the solution was subjected to electrolysis at a voltage of 3V with a current of 0.75A. After electrolysis, an aqueous solution of hydrofluoric acid saturated with potassium fluoride is supplied in excess to the reaction solution in the chamber with the anode. The resulting reaction product was recovered by filtration as a yellow solid. K 2 MnF6 .

Embodiment 1

[0094] Fill a two liter polyethylene beaker with 232cm 3 40% by weight of fluorotitanic acid (40% H 2 TiF 6 , from MoritaChemical Industries Co., Ltd.), 454cm 3 50% HF (50% high-purity hydrofluoric acid, semiconductor grade (SA grade), from Stella Chemifa Corporation) and 570cm 3 Pure water to start the first step. After stirring and mixing, a solution was obtained, which was named the first solution. The next step involved filling a one-liter polyethylene beaker (which had been placed in a water bath with ice) with 720 g (407 cm 3 ) Aqueous cesium hydroxide solution (comprising 50% by weight of CsOH from Nihon Kagaku Sangyo Co., Ltd.). Further fill the beaker with stirring to 248cm 3 water, then fill it into 89cm little by little 3 50% HF. After continued stirring and cooling, a solution was obtained, which was named the second solution. 11.9 g of K prepared in Reference Example 1 were provided to the first solution 2 MnF 6 (powder form), stir to complete dissoluti...

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Abstract

A red fluorescent substance includes an Mn-activated complex fluoride represented by the formula (1) below: A<1>2MF6:Mn (1) (wherein, letter M is one or two or more of tetravalent elements selected from Si, Ti, Zr, Hf, Ge, and Sn, with Ti or Ge being essential; and symbol A<1> is one or two or more of alkali metals selected from Li, Na, K, Rb, and Cs, with at least one of Na, Rb, and Cs being essential), wherein the red fluorescent substance has an emission spectrum having a peak between 600 to 650 nm, a fluorescent life time up to 5.0 milliseconds at room temperature, and an internal quantumefficiency at least 0.60 at the time of excitation at 450 nm. Because of the short fluorescent life time, high emission intensity, and high emission efficiency, the red fluorescent substance is suitable for use in the display device that needs high-speed high-definition rendering.

Description

[0001] Cross References to Related Applications [0002] This nonprovisional application claims priority under 35 U.S.C. Section 119(a) to Patent Application No. 2016-202546 filed in Japan on October 14, 2016, the entire contents of which are hereby incorporated by reference into this article. technical field [0003] The present invention relates to red phosphors (composite fluoride phosphors) usable in white light-emitting diodes (LEDs) and methods for their preparation. Background technique [0004] White LEDs have now come to require phosphors that emit red light when excited by light ranging from near ultraviolet to blue corresponding to the emission of the LED chip. The need arises for white LEDs to improve color rendering when they are used as backlights for liquid crystal displays. Studies are underway to meet this demand, one of which is disclosed in Patent Document 1 (JP-T 2009-528429). It mentions that a promising one of such fluorescent substances is a compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67C09K11/66H01L33/50
CPCC09K11/665C09K11/675H01L33/502H01L2933/0041C09K11/57C09K11/613
Inventor 金吉正实
Owner SHIN ETSU CHEM IND CO LTD
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