OXYNITRIDE-BASED FLUORESCENT MATERIAL AND LIGHT-EMITTING DEVICE USING THE SAME

• Main Authors: YOSHIMURA FUMITAKA, HUANG WAN-YU, RYU JOKI
• Format: Patent
• Language: English; Japanese
• Published: 05.01.2015
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; BLASTING; CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FREQUENCY-CHANGING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; NON-PORTABLE LIGHTING DEVICES; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PHYSICS; POLISHES; SEMICONDUCTOR DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide an oxynitride-based fluorescent material having high chromatic purity which can bury a cleavage between blue and green by emitting light from blue to green.SOLUTION: A fluorescent material comprising a crystal phase having a composition represented by the following formula [1]: (A,R)DENO[1] (In the formula, A represents an alkaline earth metal element; R represents activator elements essentially containing europium (Eu) and cerium (Ce); D represents a tetra-valent element essentially containing silicon (Si); E represents a tri-valent element essentially containing aluminum (Al); x represents a number which satisfies 0.0001≤x≤0.20; and a, b, c, and d represent numbers which respectively satisfies 1.2≤a<2, 1<b≤1.8, 2.2≤c<3, 2<d≤2.8, and 2.6<a+b<3.4 and 4.6<c+d<5.4.) 【課題】青色〜緑色に発光して青色と緑色の谷間を埋めることができる色純度の高い酸窒化物系蛍光体を提供する。【解決手段】下記式［１］：（Ａ１−ｘ，Ｒｘ）ＤａＥｂＮｃＯｄ［１］（式［１］中、Ａはアルカリ土類金属元素を示し、Ｒはユーロピウム（Ｅｕ）およびセリウム（Ｃｅ）を必須とする付活剤元素を示し、Ｄはケイ素（Ｓｉ）を必須とする４価の元素を示し、Ｅはアルミニウム（Ａｌ）を必須とする３価の元素を示し、ｘは０．０００１ ｘ ０．２０を満たす数を示し、ａ、ｂ、ｃ及びｄは、それぞれ、１．２ ａ＜２、１＜ｂ １．８、２．２ ｃ＜３、２＜ｄ ２．８、２．６＜ａ＋ｂ＜３．４、４．６＜ｃ＋ｄ＜５．４を満たす数を示す。）で表される組成を有する結晶相を含む蛍光体。【選択図】図５