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
CN107955604AInactive Publication Date: 2018-04-24SHIN ETSU CHEM IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHIN ETSU CHEM IND CO LTD
Publication Date
2018-04-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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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