JP5459989B2 - Laminated body and light emitting structure - Google Patents
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Description
本発明は、蛍光発光を示す積層体に関するものである。 The present invention relates to a laminate that exhibits fluorescence.
従来、蛍光発光層と紫外線光源を備え、紫外線光源のオン（紫外線照射下）・オフ（可視光下）の切替えにより、オフ時には表側（前面側）の表示内容を優先的に見せ、オン時には裏面の表示内容を優先的に見せる表示装置等が開発されている。このような装置では、紫外線光源のオン・オフを切替えるとともに、表示板前面またはその間に、優先される表示部以外（背後の光源等）を隠蔽するような層を積層することが行われている。例えば、特許文献１では、２種の異なる表示内容の樹脂フィルムの間にハーフミラーを介在させ、特許文献２では、表示板前面に透明ビーズ層を積層している。しかしながら、このような隠蔽層を積層する場合、隠蔽率が低すぎると、表示内容が混合するおそれがあり、反対に隠蔽率が高すぎると表示部の視認性が低下するおそれがある。 Conventionally, it has a fluorescent light emitting layer and an ultraviolet light source. By switching the ultraviolet light source on (under ultraviolet irradiation) and off (under visible light), the display content on the front side (front side) is preferentially displayed when off, and the back surface when on. A display device or the like that preferentially displays the display content is developed. In such an apparatus, an ultraviolet light source is switched on and off, and a layer that hides other than the priority display portion (light source behind) is laminated on the front surface of the display panel or in between. . For example, in Patent Document 1, a half mirror is interposed between two types of resin films having different display contents, and in Patent Document 2, a transparent bead layer is laminated on the front surface of the display plate. However, when such a concealment layer is laminated, if the concealment rate is too low, the display contents may be mixed, and conversely if the concealment rate is too high, the visibility of the display unit may be deteriorated.
これに対し、特許文献３では、蛍光発光層の視認性を向上させるために、光源の背後にミラー処理した反射層を設け、紫外線の外部漏洩を防止し輝度の高い蛍光表示とすることが行われている。しかしながら、光源の背後に反射層を設けるのみでは、表示部の蛍光層で蛍光発光に使用されなかった紫外線は漏出されるため発光効率が低下するおそれがある。 On the other hand, in Patent Document 3, in order to improve the visibility of the fluorescent light emitting layer, a reflective layer that is mirror-processed is provided behind the light source to prevent external leakage of ultraviolet rays and to achieve a fluorescent display with high luminance. It has been broken. However, if only a reflective layer is provided behind the light source, ultraviolet light that has not been used for fluorescent light emission in the fluorescent layer of the display unit is leaked, so that the light emission efficiency may be reduced.
本発明は、上述のような問題点に鑑みなされたものであり、可視光下と紫外線照射下で異なる表示が可能な蛍光発光積層体において、蛍光発光表示部の発光効率を向上させ、さらに、積層体と光源の組み合わせによって、容易に表示内容を変化させることを目的とするものである。 The present invention has been made in view of the above problems, and in a fluorescent light emitting laminate capable of different display under visible light and ultraviolet irradiation, the luminous efficiency of the fluorescent light emitting display unit is improved, The object is to easily change the display contents by a combination of a laminate and a light source.
本発明者は、上記目的を達成するため鋭意検討を行った結果、紫外線が照射される面とは反対側の表面に波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層が積層されていることを特徴とする蛍光発光積層体に想到し、本発明を完成させるに至った。
すなわち、本発明蛍光発光積層体は、下記の特徴を有するものである。
As a result of intensive studies to achieve the above object, the present inventor has found that an ultraviolet reflection layer having an ultraviolet reflectance of 25% or more in a wavelength region of 300 nm to 400 nm on a surface opposite to a surface irradiated with ultraviolet rays. The inventors have conceived a fluorescent light-emitting laminate characterized by being laminated, and have completed the present invention.
That is, the fluorescent light-emitting laminate of the present invention has the following characteristics.
１．紫外線光源の照射により、発光する積層体であって、
紫外線が照射される側に蛍光発光を示す蛍光発光層（Ａ）、
紫外線が照射される側と反対側に、半透明で、かつ波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）、
が積層され、
上記紫外線反射層（Ｂ）が、紫外線反射性粉体と透光性材料を含み、
上記紫外線反射性粉体が、３００ｎｍ〜４００ｎｍでの紫外線反射率が５０％以上、屈折率が１．５〜２．４であることを特徴とする積層体。
２．上記紫外線反射層（Ｂ）が、隠蔽率１５％以上７０％以下であることを特徴とする１．に記載の積層体。
３．１．または２．に記載の積層体と、該積層体の蛍光発光層（Ａ）側に紫外線光源（Ｄ）を備えることを特徴とする発光構造体。
４．紫外線光源の照射により、発光する積層体であって、
蛍光発光を示す蛍光発光層（Ａ１）、半透明で、かつ波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）、及び蛍光発光を示す蛍光発光層（Ａ２）が積層され、
上記紫外線反射層（Ｂ）が、紫外線反射性粉体と透光性材料を含み、
上記紫外線反射性粉体が、３００ｎｍ〜４００ｎｍでの紫外線反射率が５０％以上、屈折率が１．５〜２．４であることを特徴とする積層体。
５．上記紫外線反射層（Ｂ）が、隠蔽率１５％以上７０％以下であることを特徴とする４．に記載の積層体。
６．４．または５．に記載の積層体と、該積層体の蛍光発光層（Ａ１）及び／または蛍光発光層（Ａ２）側に紫外線光源（Ｄ）を備えることを特徴とする発光構造体。
1. A laminate that emits light when irradiated with an ultraviolet light source,
A fluorescent light emitting layer (A) showing fluorescent light emission on the side irradiated with ultraviolet rays,
On the side opposite to the side irradiated with ultraviolet rays, the ultraviolet reflecting layer (B) which is translucent and has an ultraviolet reflectance of 25% or more in a wavelength region of 300 nm to 400 nm,
Are stacked,
The ultraviolet reflective layer (B) includes an ultraviolet reflective powder and a translucent material,
The laminate according to claim 1, wherein the ultraviolet reflective powder has an ultraviolet reflectance at 300 nm to 400 nm of 50% or more and a refractive index of 1.5 to 2.4.
2. The ultraviolet reflective layer (B) has a concealment rate of 15% or more and 70% or less. The laminated body as described in.
3.1. Or 2. And a UV light source (D) on the fluorescent light emitting layer (A) side of the laminate.
4). A laminate that emits light when irradiated with an ultraviolet light source,
Fluorescent-emitting layer showing fluorescence emission (A1), a semi-transparent and UV-reflecting layer UV reflectance in the wavelength region 300nm~400nm is 25% or more (B), and fluorescent-emitting layer showing fluorescence emission (A2) Are stacked ,
The ultraviolet reflective layer (B) includes an ultraviolet reflective powder and a translucent material,
The laminate according to claim 1, wherein the ultraviolet reflective powder has an ultraviolet reflectance at 300 nm to 400 nm of 50% or more and a refractive index of 1.5 to 2.4.
5. 3. The ultraviolet reflective layer (B) has a concealment rate of 15% to 70%. The laminated body as described in.
6). 4). Or 5. And an ultraviolet light source (D) on the fluorescent light emitting layer (A1) and / or fluorescent light emitting layer (A2) side of the laminated body.
本発明の積層体は、紫外線が照射される側に蛍光発光層（Ａ）が設けられ、紫外線が照射される側とは反対側の表面に、波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）を積層することにより、蛍光発光表示部の発光効率を向上させ、さらに、積層体と光源の組み合わせによって、容易に表示内容を変化させることができるものである。 The laminate of the present invention is provided with the fluorescent light emitting layer (A) on the side irradiated with ultraviolet rays, and has an ultraviolet reflectance of 25 in the wavelength region of 300 nm to 400 nm on the surface opposite to the side irradiated with ultraviolet rays. % Or more of the ultraviolet light reflecting layer (B) is laminated to improve the light emission efficiency of the fluorescent light emitting display part, and the display content can be easily changed by the combination of the laminated body and the light source. .
以下、本発明を実施するための最良の形態について詳細に説明する。 Hereinafter, the best mode for carrying out the present invention will be described in detail.
（積層体）
本発明は、紫外線を照射することにより発光する積層体であり、紫外線が照射される側に蛍光発光を示す蛍光発光層（Ａ）、その反対側表面に波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）を積層した積層体である。
(Laminate)
The present invention is a laminate that emits light when irradiated with ultraviolet rays, the fluorescent light emitting layer (A) that exhibits fluorescent light emission on the side irradiated with ultraviolet rays, and the ultraviolet reflectance in the wavelength region of 300 nm to 400 nm on the opposite surface. Is a laminated body in which an ultraviolet reflective layer (B) having 25% or more is laminated.
本発明の蛍光発光層（Ａ）とは、透光性を有する材料（以下、「透光性材料」という。）に蛍光発光を示す顔料、染料等（以下、「蛍光材料」という。）を含むものである。 The fluorescent light emitting layer (A) of the present invention is a pigment, dye or the like (hereinafter referred to as “fluorescent material”) that exhibits fluorescent light emission on a light transmitting material (hereinafter referred to as “translucent material”). Is included.
透光性材料としては、透光性を有するものであれば、無機質材料、有機質材料のどちらでもよい。例えば、無機質材料としては、ガラス、水ガラス、低融点ガラス、シリコン樹脂、アルコキシシラン等があげられる。また、有機質材料としては、アクリル樹脂、アクリル−スチレン樹脂、セルロールアセトブチレート樹脂、セルロースプロピオネート樹脂、ポリメチルペンテン樹脂、ポリカーボネート樹脂、ポリスチレン樹脂、ポリエステル樹脂等、または反応固化型のエポキシ樹脂、アクリル樹脂、メタクリル樹脂、ウレタン樹脂等が挙げられる。なお、「透光性」とは、可視光透過性に優れ、透明性を有するものである。 As the translucent material, any of an inorganic material and an organic material may be used as long as it has translucency. For example, examples of the inorganic material include glass, water glass, low-melting glass, silicon resin, and alkoxysilane. Organic materials include acrylic resin, acrylic-styrene resin, cellulose acetobutyrate resin, cellulose propionate resin, polymethylpentene resin, polycarbonate resin, polystyrene resin, polyester resin, etc., or reaction-solidified epoxy resin , Acrylic resin, methacrylic resin, urethane resin and the like. In addition, “translucency” is excellent in visible light transparency and has transparency.
蛍光材料としては、紫外線照射下において蛍光発光を示すものであれば限定されず、公知の蛍光染料や蛍光顔料等を使用することができる。本発明では、可視光下において蛍光発光を示さないものが好ましく、このような蛍光体の中でも、蛍光発光持続性、耐候性にも優れる無機蛍光顔料が特に好ましい。 The fluorescent material is not limited as long as it exhibits fluorescence emission under ultraviolet irradiation, and known fluorescent dyes, fluorescent pigments, and the like can be used. In the present invention, those that do not exhibit fluorescence emission under visible light are preferred, and among these phosphors, inorganic fluorescent pigments that are excellent in fluorescence emission durability and weather resistance are particularly preferred.
蛍光発光層（Ａ）は、上記透光性材料と上記蛍光材料を含む組成物（以下「蛍光発光層用組成物」という。）を、フィルム状または板状等に成形したものである。 その厚みは、通常０．０１ｍｍ〜１０ｍｍ、より好ましくは０．０５〜５ｍｍである。蛍光発光層用組成物は、透光性材料（固形分）１００重量部に対して、蛍光材料を０．５〜５０重量部、さらには１〜３０重量部添加することが好ましい。０．５重量部より少ない場合、蛍光発光層の輝度が低くなり視認性に劣るおそれがある。また、５０重量部より多く添加しても輝度の向上が確認できないおそれがある。 The fluorescent light emitting layer (A) is obtained by molding a composition containing the above translucent material and the above fluorescent material (hereinafter referred to as “composition for fluorescent light emitting layer”) into a film shape or a plate shape. The thickness is usually 0.01 mm to 10 mm, more preferably 0.05 to 5 mm. The composition for a fluorescent light emitting layer is preferably added with 0.5 to 50 parts by weight, and more preferably 1 to 30 parts by weight of the fluorescent material with respect to 100 parts by weight of the translucent material (solid content). When the amount is less than 0.5 part by weight, the luminance of the fluorescent light emitting layer is lowered and the visibility may be inferior. Moreover, even if it adds more than 50 weight part, there exists a possibility that the improvement of a brightness | luminance cannot be confirmed.
本発明の積層体には、少なくとも１つの蛍光発光層（Ａ）が設けられていればよいが、２つの蛍光発光層（Ａ１）、蛍光発光層（Ａ２）（以下、単に「（Ａ１）」、「（Ａ２）」ともいう。）を設けることもできる。この場合、（Ａ１）と（Ａ２）は下記の紫外線反射層（Ｂ）を挟むように設けられる。
(Ａ１)、(Ａ２)は、透光性材料と蛍光材料を含むものであり、各々同一のものを使用しても良いが、表示内容を変化させる場合には、（Ａ１）と（Ａ２）の蛍光材料が異なることが好ましい。
紫外線反射層（Ｂ）を挟むように（Ａ１）、（Ａ２）が設けられた場合、（Ａ１）、（Ａ２）のどちらか一方に紫外線を照射し、それぞれの層を個々に発光させてもよいが、（Ａ１）、（Ａ２）に同時に紫外線を照射することもできる。この場合、（Ａ１）と（Ａ２）の蛍光発光が調和し、美観性に優れる発光を得ることができる。
The laminate of the present invention may be provided with at least one fluorescent light emitting layer (A), but two fluorescent light emitting layers (A1) and fluorescent light emitting layer (A2) (hereinafter simply referred to as “(A1)”). , "(A2)") can also be provided. In this case, (A1) and (A2) are provided so as to sandwich the following ultraviolet reflective layer (B).
(A1) and (A2) include a translucent material and a fluorescent material, and the same material may be used. However, when changing the display contents, (A1) and (A2) It is preferable that the fluorescent materials are different.
When (A1) and (A2) are provided so as to sandwich the ultraviolet reflecting layer (B), either one of (A1) or (A2) is irradiated with ultraviolet rays, and each layer emits light individually. Although it is good, (A1) and (A2) can be irradiated with ultraviolet rays simultaneously. In this case, the fluorescence emission of (A1) and (A2) is harmonized, and emission with excellent aesthetics can be obtained.
本発明の積層体は、紫外線が照射される側に上記蛍光発光層（Ａ）、紫外線が照射される側と反対側に、波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）を積層したものであり、前記波長領域の紫外線を反射（散乱）する粉体（以下「紫外線反射性粉体」という）と、透光性材料を含む層を、蛍光発光層（Ａ）に積層したもの、あるいは、紫外線反射性粉体と、透光性材料を含む層を（Ａ１）と（Ａ２）で挟むように積層したものである。 The laminate of the present invention has an ultraviolet reflectance of 25% or more in the wavelength region of 300 nm to 400 nm on the fluorescent light emitting layer (A) on the side irradiated with ultraviolet rays and on the side opposite to the side irradiated with ultraviolet rays. A layer comprising a reflective layer (B), and a layer containing a powder that reflects (scatters) ultraviolet rays in the wavelength region (hereinafter referred to as “ultraviolet reflective powder”) and a translucent material, A layered product in (A), or a layered product containing ultraviolet reflective powder and a layer containing a translucent material so as to be sandwiched between (A1) and (A2).
紫外線反射層（Ｂ）を積層することにより、蛍光発光層（Ａ）において蛍光体の励起に利用されず放出されようとする紫外線を（Ｂ）が反射し、（Ａ）に再度紫外線を照射し蛍光発光を繰り返すことにより、発光効率を向上させることができる。この場合、照射された紫外線が、（Ｂ）層を通過し放出されることはほとんどない。 By laminating the ultraviolet reflecting layer (B), the fluorescent light emitting layer (A) reflects (B) the ultraviolet rays that are going to be emitted without being used for excitation of the phosphor, and (A) is irradiated again with ultraviolet rays. By repeating fluorescence emission, luminous efficiency can be improved. In this case, the irradiated ultraviolet rays hardly pass through the layer (B) and are released.
透光性材料としては、蛍光発光層（Ａ）と同様のものが使用できる。
また、紫外線反射性粉体は、波長領域３００ｎｍ〜４００ｎｍの全領域において、紫外線反射率が５０％以上、屈折率が１．５〜２．４であることが好ましい。また、粒子径は特に限定されないが、通常０．２μｍ以下、または０．４μｍ以上１０μｍ以下が好ましい。このような紫外線反射性粉体としては、例えば、アルミナ、酸化ジルコニウム、硫酸バリウム、炭酸カルシウム等を使用することができる。
As the translucent material, the same material as the fluorescent light emitting layer (A) can be used.
The ultraviolet reflective powder preferably has an ultraviolet reflectance of 50% or more and a refractive index of 1.5 to 2.4 over the entire wavelength region of 300 nm to 400 nm. The particle size is not particularly limited, but is usually preferably 0.2 μm or less, or 0.4 μm or more and 10 μm or less. As such an ultraviolet reflective powder, for example, alumina, zirconium oxide, barium sulfate, calcium carbonate, or the like can be used.
紫外線反射層は、上記透光性材料と上記紫外線反射性粉体を含む組成物（以下、「紫外線反射層用組成物」という。）を、半透明で、かつ波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上となるように、フィルム状または板状等に成形したものである。その厚みは、半透明で、上記の紫外線反射率を満たす範囲で適宜設定すればよく、通常０．０１ｍｍ〜１０ｍｍ、より好ましくは０．０５〜５ｍｍである。紫外線反射層用組成物は、使用する紫外線反射性粉体の種類、成形する紫外線反射層の厚みにもよるが、透光性材料（固形分）１００重量部に対して、紫外線反射性粉体を３０〜４００重量部、さらには５０〜３００重量部添加することが好ましい。このような範囲であれば、本発明の効果が得られ易い。 The ultraviolet reflecting layer is a semi-transparent composition containing the translucent material and the ultraviolet reflecting powder (hereinafter referred to as “ultraviolet reflecting layer composition”) in the wavelength region of 300 nm to 400 nm. The film is formed into a film shape or a plate shape so that the reflectance is 25% or more. The thickness is semi-transparent and may be appropriately set within a range satisfying the above-described ultraviolet reflectance, and is usually 0.01 mm to 10 mm, more preferably 0.05 to 5 mm. Although the composition for ultraviolet reflective layer depends on the type of ultraviolet reflective powder used and the thickness of the ultraviolet reflective layer to be molded, the ultraviolet reflective powder with respect to 100 parts by weight of the translucent material (solid content). Is preferably added in an amount of 30 to 400 parts by weight, more preferably 50 to 300 parts by weight. If it is such a range, the effect of this invention will be easy to be acquired.
また、本発明の紫外線反射層（Ｂ）は、本発明積層体に紫外線を照射した場合、紫外線反射層を介して蛍光発光層の発光が視認できる程度に、透明または半透明であればよい。 Moreover, the ultraviolet reflective layer (B) of this invention should just be transparent or translucent so that light emission of a fluorescence light emitting layer can be visually recognized through an ultraviolet reflective layer, when an ultraviolet-ray is irradiated to this invention laminated body.
具体的には、紫外線反射層（Ｂ）の隠蔽率が、７０％以下（好ましくは１５％〜６０％）であることが好ましい。７０％を超える場合は、蛍光発光の視認性が低下するおそれがある。また、隠蔽率を１５％以上とすることによって、蛍光発光層側の光源の形状を、紫外線反射層を介して視認され難くすることもできる。
隠蔽率を測定する方法としては、紫外線反射層を隠蔽率試験紙上に置き、白地上と黒地上の視感反射率から隠蔽率を算出す方法が挙げられる。
なお、視感反射率は色彩色差計（「ＣＲ−３００」：ミノルタ株式会社製）を用いて測定し算出することができる。
Specifically, the concealment rate of the ultraviolet reflecting layer (B) is preferably 70% or less (preferably 15% to 60%). If it exceeds 70%, the visibility of fluorescent emission may be reduced. Further, by setting the concealment rate to 15% or more, the shape of the light source on the fluorescent light emitting layer side can be made difficult to be visually recognized through the ultraviolet reflecting layer.
As a method for measuring the concealment rate, there is a method in which an ultraviolet reflection layer is placed on a concealment rate test paper and the concealment rate is calculated from the luminous reflectance of white ground and black ground.
The luminous reflectance can be measured and calculated using a color difference meter (“CR-300” manufactured by Minolta Co., Ltd.).
また、紫外線反射層は波長領域３００ｎｍ〜４００ｎｍにおける紫外線反射率が２５％以上（好ましくは３０％以上）であることにより、蛍光体の励起に利用されずに放出されようとする紫外線を反射し、（Ａ）に再度紫外線を照射し蛍光発光を繰り返すことにより、発光効率を向上させることができる。
紫外線反射率が２５％より小さい場合は、紫外線が漏出してしまうおそれがあり、蛍光発光層の発光効率向上効果を阻害するおそれがある。
なお、紫外線反射率は、分光光度計（株式会社島津製作所製、ＵＶ−３１００）で測定した値である。
Further, the ultraviolet reflection layer reflects the ultraviolet rays that are about to be emitted without being used for excitation of the phosphor, because the ultraviolet reflectance in the wavelength region of 300 nm to 400 nm is 25% or more (preferably 30% or more). Luminescence efficiency can be improved by irradiating (A) with ultraviolet rays again and repeating fluorescence.
When the ultraviolet reflectance is less than 25%, there is a possibility that ultraviolet rays may leak out, which may hinder the effect of improving the luminous efficiency of the fluorescent light emitting layer.
The ultraviolet reflectance is a value measured with a spectrophotometer (manufactured by Shimadzu Corporation, UV-3100).
さらに、上記の紫外線反射層（Ｂ）を（Ａ１）と（Ａ２）で挟むように積層した積層体において、（Ａ１）のみに紫外線を照射した場合、（Ａ１）の励起に使用されなかった紫外線は、紫外線反射層（Ｂ）で反射されるため（Ｂ）を透過し（Ａ２）へ達することは殆どない。仮に（Ｂ）を透過したとしてもその光量は微量であるため、（Ａ２）の発光は弱く視認されにくく、（Ａ１）の発光のみを視認できる。（Ａ２）のみに紫外線を照射した場合も同様である。 Further, in the laminate in which the above-described ultraviolet reflection layer (B) is laminated so as to be sandwiched between (A1) and (A2), when only (A1) is irradiated with ultraviolet rays, the ultraviolet rays not used for excitation of (A1) Is reflected by the ultraviolet reflecting layer (B), and therefore hardly passes through (B) and reaches (A2). Even if (B) is transmitted, the amount of light is very small, so that the light emission of (A2) is weak and difficult to be visually recognized, and only the light emission of (A1) can be visually recognized. The same applies to the case where only (A2) is irradiated with ultraviolet rays.
本発明積層体は、紫外線が照射される側から順に、蛍光発光層（（Ａ）層）、紫外線反射層（（Ｂ）層）が積層されていればよく、本発明の効果を阻害しない限りであれば蛍光発光層と紫外線反射層の他、透光性を有する基材（（Ｃ）層）等を積層することもできる。例えば、以下の構造が挙げられる（図１）。 In the laminate of the present invention, a fluorescent light emitting layer ((A) layer) and an ultraviolet reflective layer ((B) layer) may be laminated in order from the side irradiated with ultraviolet rays, as long as the effects of the present invention are not impaired. If so, in addition to the fluorescent light emitting layer and the ultraviolet reflecting layer, a light-transmitting base material ((C) layer) and the like can be laminated. For example, the following structure is mentioned (FIG. 1).
紫外線が照射される側から順に、
（ａ）（Ａ）層、（Ｂ）層、
（ｂ）（Ｃ）層、（Ａ）層、（Ｂ）層、
（ｃ）（Ａ）層、（Ｃ）層、（Ｂ）層、
（ｄ）（Ａ）層、（Ｂ）層、（Ｃ）層、
となるような積層構造が挙げられる。
In order from the side irradiated with ultraviolet rays,
(A) (A) layer, (B) layer,
(B) (C) layer, (A) layer, (B) layer,
(C) (A) layer, (C) layer, (B) layer,
(D) (A) layer, (B) layer, (C) layer,
Such a laminated structure is given.
また、蛍光発光層（Ａ）が（Ａ１）、（Ａ２）の２つからなる場合、例えば（図２）
（ｅ）（Ａ１）層、（Ｂ）層、（Ａ２）層、
（ｆ）（Ｃ）層、（Ａ１）層、（Ｂ）層、（Ａ２）層、
（ｇ）（Ａ１）層、（Ｃ）層、（Ｂ）層、（Ａ２）層、
（ｈ）（Ａ１）層、（Ｂ）層、（Ｃ）層、（Ａ２）層、
（ｉ）（Ａ１）層、（Ｂ）層、（Ｃ）層、（Ｂ）層、（Ａ２）層、
となるような積層構造が挙げられる。
Further, when the fluorescent light emitting layer (A) is composed of two layers (A1) and (A2), for example (FIG. 2)
(E) (A1) layer, (B) layer, (A2) layer,
(F) (C) layer, (A1) layer, (B) layer, (A2) layer,
(G) (A1) layer, (C) layer, (B) layer, (A2) layer,
(H) (A1) layer, (B) layer, (C) layer, (A2) layer,
(I) (A1) layer, (B) layer, (C) layer, (B) layer, (A2) layer,
Such a laminated structure is given.
上記（ａ）〜（ｉ）における、蛍光発光層（（Ａ）層）は、均一に存在しても、不連続に存在してもよく、また複数の蛍光発光層を組み合せて意匠性を付与することもできる。 In the above (a) to (i), the fluorescent light emitting layer ((A) layer) may be present uniformly or discontinuously, and a design property is imparted by combining a plurality of fluorescent light emitting layers. You can also
また、透光性を有する基材（Ｃ）は、本発明の効果を阻害しないものであればよく、透光性材料をフィルム状、板状に成形したものを使用することができる。また、市販されているガラス板、樹脂板、樹脂フィルム等を使用してもよい。その厚みは、使用する基材の種類によって適宜設定すればよいが、通常、０．０５ｍｍ〜１０ｍｍであることが好ましい。厚すぎる場合は、波長領域３００ｎｍ〜４００ｎｍにおける紫外線吸収率が大きくなり、蛍光発光層の発光効率向上効果を阻害するおそれがある。また、可視光を吸収し、蛍光発光を吸収するため発光が視認できなくなるおそれもある。 Moreover, the base material (C) which has translucency should just be a thing which does not inhibit the effect of this invention, and what shape | molded the translucent material in the film form and plate shape can be used. Moreover, you may use the glass plate, resin plate, resin film, etc. which are marketed. The thickness may be appropriately set depending on the type of base material to be used, but is usually preferably 0.05 mm to 10 mm. When it is too thick, the ultraviolet absorption rate in the wavelength region of 300 nm to 400 nm is increased, which may hinder the effect of improving the light emission efficiency of the fluorescent light emitting layer. Moreover, since visible light is absorbed and fluorescent light emission is absorbed, there exists a possibility that light emission cannot be visually recognized.
本発明積層体の製造方法は、特に限定されないが、例えば、蛍光発光層用組成物、紫外線反射層用組成物をフィルム状、板状等に成形した蛍光発光層（Ａ）、紫外線反射層（Ｂ）を接着剤等を介して積層する方法、蛍光発光層に紫外線反射層用組成物を塗付し、硬化させる方法、または、紫外線反射層に蛍光発光層用組成物を塗付し、硬化させる方法等が挙げられる。 Although the manufacturing method of this invention laminated body is not specifically limited, For example, the fluorescent light emitting layer (A) which shape | molded the composition for fluorescent light emitting layers, the composition for ultraviolet reflective layers into a film form, plate shape, etc., ultraviolet reflective layer ( B) a method of laminating via an adhesive or the like, a method of applying a composition for an ultraviolet reflecting layer to a fluorescent light emitting layer and curing, or a method of applying a composition for a fluorescent light emitting layer to an ultraviolet reflecting layer and curing And the like.
上記蛍光発光層用組成物、または紫外線反射層用組成物をフィルム状、板状等に成形する際には、公知の成形方法で行えばよく、例えば、型枠成形、射出成形、注型成形等が挙げられ、蛍光発光層用組成物、または紫外線反射層用組成物を塗付する際には、スプレー、ローラー、こて、レシプロ、コーター、流し込み等の手段を用いることができる。また、成形時に、各組成物に、例えば、着色材、可塑剤、難燃剤、滑剤、防腐剤、防黴剤、防藻剤、抗菌剤、分散剤、消泡剤、造膜助剤、吸着剤、架橋剤、酸化防止剤、触媒、ブロッキング防止剤等が含まれていてもよく、このような成分を常法で均一に混合して成形体を作製することができる。特に、有機顔料、無機顔料、染料等の着色材を混合することによって、積層体に紫外線を照射した場合、着色材と蛍光発光層（Ａ）の発光の相乗効果により、様々な色相の蛍光発光を得ることができる。 When the fluorescent light emitting layer composition or the ultraviolet reflective layer composition is formed into a film, plate, or the like, a known molding method may be used. For example, mold molding, injection molding, cast molding When applying the composition for a fluorescent light emitting layer or the composition for an ultraviolet reflective layer, means such as spray, roller, trowel, reciprocator, coater, and pouring can be used. Moreover, at the time of molding, for example, coloring materials, plasticizers, flame retardants, lubricants, preservatives, antifungal agents, antialgae agents, antibacterial agents, dispersants, antifoaming agents, film-forming aids, adsorption agents An agent, a crosslinking agent, an antioxidant, a catalyst, an antiblocking agent and the like may be contained, and such a component can be uniformly mixed by a conventional method to produce a molded product. In particular, when the laminate is irradiated with ultraviolet rays by mixing colorants such as organic pigments, inorganic pigments, dyes, etc., the fluorescent emission of various hues is caused by the synergistic effect of the emission of the colorants and the fluorescent emission layer (A). Can be obtained.
蛍光発光層（Ａ）と紫外線反射層（Ｂ）を、接着剤等を介して積層する場合、本発明の効果を阻害しないような透光性の接着剤、粘着剤、粘着テープ等を使用することができる。また、上記蛍光発光層用組成物、または紫外線反射層用組成物の乾燥は通常、常温で行えばよいが加熱することも可能である。 When the fluorescent light emitting layer (A) and the ultraviolet light reflecting layer (B) are laminated via an adhesive or the like, a translucent adhesive, pressure sensitive adhesive, pressure sensitive adhesive tape or the like that does not impair the effects of the present invention is used. be able to. Moreover, although the said fluorescent light emitting layer composition or the composition for ultraviolet reflection layers may be normally dried at normal temperature, it can also be heated.
（発光構造体）
本発明の発光構造体は、紫外線光源（Ｄ）（光源（Ｄ））及び、上記蛍光発光層（Ａ）、と上記紫外線反射層（Ｂ）が積層されている積層体を備えるものである。紫外線光源（Ｄ）は、積層体の蛍光発光層（Ａ）側に配置される。例えば、以下の構造が挙げられる（図１）。
(Light emitting structure)
The light emitting structure of the present invention comprises a laminate in which an ultraviolet light source (D) (light source (D)), the fluorescent light emitting layer (A), and the ultraviolet reflective layer (B) are laminated. The ultraviolet light source (D) is disposed on the fluorescent light emitting layer (A) side of the laminate. For example, the following structure is mentioned (FIG. 1).
（ａ）光源（Ｄ）、（Ａ）層、（Ｂ）層、
（ｂ）光源（Ｄ）、（Ｃ）層、（Ａ）層、（Ｂ）層、
（ｃ）光源（Ｄ）、（Ａ）層、（Ｃ）層、（Ｂ）層、
（ｄ）光源（Ｄ）、（Ａ）層、（Ｂ）層、（Ｃ）層、
となるような発光構造体が挙げられる。
(A) Light source (D), (A) layer, (B) layer,
(B) Light source (D), (C) layer, (A) layer, (B) layer,
(C) Light source (D), (A) layer, (C) layer, (B) layer,
(D) Light source (D), (A) layer, (B) layer, (C) layer,
Such a light emitting structure is given.
蛍光発光層が２層からなる場合は、光源（Ｄ）は通常（Ａ１）側と（Ａ２）側両方に配置されるものである。例えば（図２）
（ｅ）光源（Ｄ）、（Ａ１）層、（Ｂ）層、（Ａ２）層、光源（Ｄ）、
（ｆ）光源（Ｄ）、（Ｃ）層、（Ａ１）層、（Ｂ）層、（Ａ２）層、光源（Ｄ）、
（ｇ）光源（Ｄ）、（Ａ１）層、（Ｃ）層、（Ｂ）層、（Ａ２）層、光源（Ｄ）、
（ｈ）光源（Ｄ）（Ａ１）層、（Ｂ）層、（Ｃ）層、（Ａ２）層、光源（Ｄ）
（ｉ）光源（Ｄ）（Ａ１）層、（Ｂ）層、（Ｃ）層、（Ｂ）層、（Ａ２）層、光源（Ｄ）、
となるような発光構造体が挙げられる。
When the fluorescent light emitting layer is composed of two layers, the light source (D) is usually disposed on both the (A1) side and the (A2) side. For example (Fig. 2)
(E) Light source (D), (A1) layer, (B) layer, (A2) layer, light source (D),
(F) Light source (D), (C) layer, (A1) layer, (B) layer, (A2) layer, light source (D),
(G) Light source (D), (A1) layer, (C) layer, (B) layer, (A2) layer, light source (D),
(H) Light source (D) (A1) layer, (B) layer, (C) layer, (A2) layer, light source (D)
(I) Light source (D) (A1) layer, (B) layer, (C) layer, (B) layer, (A2) layer, light source (D),
Such a light emitting structure is given.
上記光源（Ｄ）は（Ａ）層全面を照射するものであっても、局部的に照射しパターン（模様）を形成するものであってもよい。また、光源のＯＮ／ＯＦＦを切り替えることによって、表示内容を容易に変更することができる。
本発明に使用する光源は、紫外光を発するものであればよいが、波長３００ｎｍ〜４００ｎｍの範囲に輝線を有するものが好ましい。
上記発光構造体の発光を見る方向は、特に限定されないが、上記（Ｂ）層が半透明の場合、照射する光源（Ｄ）と反対側とすることが好ましい。この場合、（Ｂ）層を介して、（Ａ）層の背後に設置された光源の形状が視認され難くなる。
The light source (D) may irradiate the entire surface of the (A) layer, or may irradiate locally to form a pattern. Further, the display content can be easily changed by switching the light source ON / OFF.
Although the light source used for this invention should just emit an ultraviolet light, what has an emission line in the wavelength range of 300 nm-400 nm is preferable.
The direction of viewing the light emission of the light emitting structure is not particularly limited, but when the layer (B) is translucent, it is preferably on the side opposite to the illuminating light source (D). In this case, the shape of the light source installed behind the (A) layer becomes difficult to be visually recognized through the (B) layer.
上記発光構造体（ｅ）〜（ｉ）において、蛍光発光層（Ａ１）、と紫外線反射層（Ｂ）、蛍光発光層（Ａ２）が積層されている積層体の、（Ａ１）層と（Ａ２）層の面が、入れ替わるように回転等の手段により可動させることもできる。この場合、光源（Ｄ）は（Ａ１）側、（Ａ２）側のいずれか一方のみに配置すればよい。これによって、表示内容を容易に変更することが可能となる。
In the light emitting structures (e) to (i), the layers (A1) and (A2) of the laminate in which the fluorescent light emitting layer (A1), the ultraviolet reflective layer (B), and the fluorescent light emitting layer (A2) are laminated. ) The surface of the layer can be moved by means of rotation or the like so as to be interchanged. In this case, the light source (D) may be disposed only on either the (A1) side or the (A2) side. As a result, the display contents can be easily changed.
以下に実施例を示し、本発明の特徴をより明確にする。 Examples are given below to clarify the features of the present invention.
・蛍光発光層用組成物１
アクリル−スチレン樹脂エマルション１００重量部（固形分）、緑色無機蛍光顔料１４重量部、添加剤（分散剤、消泡剤等）４重量部を常法にて混合し、蛍光発光層用組成物１を作製した。
・蛍光発光層用組成物２
蛍光発光層用組成物１の緑色無機蛍光顔料の代わりに赤色無機蛍光顔料を２０重量部用いた以外は、蛍光発光層用組成物１と同様に蛍光発光層用組成物２を作製した。
-Composition 1 for fluorescent light emitting layer
100 parts by weight (solid content) of an acrylic-styrene resin emulsion, 14 parts by weight of a green inorganic fluorescent pigment, and 4 parts by weight of additives (dispersing agent, antifoaming agent, etc.) are mixed by a conventional method, and composition 1 for a fluorescent light emitting layer Was made.
・ Composition 2 for fluorescent light emitting layer
A fluorescent light emitting layer composition 2 was prepared in the same manner as the fluorescent light emitting layer composition 1 except that 20 parts by weight of the red inorganic fluorescent pigment was used instead of the green inorganic fluorescent pigment of the fluorescent light emitting layer composition 1.
・紫外線反射層用組成物１
アクリル−スチレン樹脂エマルション１００重量部（固形分）、アルミナ１６０重量部、添加剤（分散剤、消泡剤等）５重量部を常法にて混合し、紫外線反射層用組成物１を作製した。
・紫外線反射層用組成物２〜７
表１の配合に基づき、紫外線反射層用組成物１と同様に紫外線反射層用組成物２〜７を作製した。
-Composition 1 for UV reflective layer
100 parts by weight (solid content) of an acrylic-styrene resin emulsion, 160 parts by weight of alumina, and 5 parts by weight of additives (dispersant, antifoaming agent, etc.) were mixed by a conventional method to prepare UV reflective layer composition 1. .
・ Compositions 2-7 for UV reflective layer
Based on the formulation in Table 1, Compositions 2 to 7 for the ultraviolet reflective layer were prepared in the same manner as Composition 1 for the ultraviolet reflective layer.
紫外線反射層用組成物１〜７に関して、以下の評価を実施した。結果を表１、２および図３に示した。
・評価１
隠蔽率試験紙の上に、作製した紫外線反射層用組成物１〜７を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、硬化させた試験体を用い、試験体における黒地上塗膜と白地上塗膜の視感反射率を色彩色差計（「ＣＲ−３００」：ミノルタ株式会社製）を用いて測定し隠蔽率（％）を算出した。
The following evaluation was implemented regarding the compositions 1-7 for ultraviolet reflective layers. The results are shown in Tables 1 and 2 and FIG.
・ Evaluation 1
Using a test specimen obtained by coating and curing the prepared compositions 1 to 7 for ultraviolet reflective layer on a concealment rate test paper so that the coating thickness is 150 μm (dry film thickness is about 80 μm). The visual reflectance of the black ground coating film and the white ground coating film was measured using a color difference meter ("CR-300": manufactured by Minolta Co., Ltd.) to calculate the concealment rate (%).
・評価２
アクリル板上に紫外線反射層用組成物１〜７を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、硬化させた試験体を用い、波長領域３００ｎｍ〜４００ｎｍでの反射率（％）を分光光度計（「ＵＶ−３１００」：株式会社島津製作所製）で測定した。ブランクとして、アクリル板を使用した。
・ Evaluation 2
Reflection in a wavelength region of 300 nm to 400 nm using a test specimen coated and cured with an ultraviolet reflective layer composition 1-7 on an acrylic plate to a coating thickness of 150 μm (dry film thickness is about 80 μm). The rate (%) was measured with a spectrophotometer (“UV-3100” manufactured by Shimadzu Corporation). An acrylic plate was used as a blank.
（積層体の製造）
（実施例１）
ガラス板（３００ｍｍ×２００ｍｍ×３ｍｍ）の一方の面に、蛍光発光層用組成物１を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）で塗付、乾燥させ蛍光発光層（Ａ−１）を成形した。次いで、蛍光発光層（Ａ−１）とは反対側のガラス板一面に、紫外線反射層用組成物１を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、乾燥し紫外線反射層（Ｂ−１）を成形し、積層体１を得た。
(Manufacture of laminates)
Example 1
A fluorescent light emitting layer composition 1 is applied to one surface of a glass plate (300 mm × 200 mm × 3 mm) with a coating thickness of 150 μm (dry film thickness is about 80 μm) and dried to obtain a fluorescent light emitting layer (A-1) Was molded. Next, the ultraviolet reflective layer composition 1 is applied to the surface of the glass plate opposite to the fluorescent light emitting layer (A-1) so as to have a coating thickness of 150 μm (dry film thickness is about 80 μm) and dried. The ultraviolet reflective layer (B-1) was shape | molded and the laminated body 1 was obtained.
得られた積層体１に関して、以下の評価を実施した。結果を表１に示した。
・評価３
積層体１において、蛍光発光層（Ａ−１）から３ｃｍの距離に紫外線光源（６Ｗ紫外線ランプ：３６５ｎｍ）を設置した。室内蛍光灯照射下（可視光下）において、紫外線反射層（Ｂ−１）を介して蛍光発光層（Ａ−１）及びその背後に設置された紫外線光源の視認性を目視で評価し、光源の形状が認識できないものをＡ、認識できるものをＢとした。結果を表２に示した。
The following evaluation was performed on the obtained laminate 1. The results are shown in Table 1.
・ Evaluation 3
In the laminate 1, an ultraviolet light source (6 W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1). Under indoor fluorescent light irradiation (under visible light), the visibility of the fluorescent light emitting layer (A-1) and the ultraviolet light source installed behind it is visually evaluated through the ultraviolet reflecting layer (B-1). A shape was recognized as A, and B was recognized as a shape. The results are shown in Table 2.
・評価４
積層体１において、蛍光発光層（Ａ−１）から３ｃｍの距離に紫外線光源（６Ｗ紫外線ランプ：３６５ｎｍ）を設置し、暗室中で紫外線を照射し、積層体１の発光輝度（ｃｄ／ｍ２）を、色彩輝度計「ＢＭ−５Ａ」（株式会社トプコン製）を用いて測定した。結果を表２に示した。
・ Evaluation 4
In the laminate 1, an ultraviolet light source (6 W ultraviolet lamp: 365 nm) is installed at a distance of 3 cm from the fluorescent light emitting layer (A-1), irradiated with ultraviolet rays in a dark room, and the emission luminance (cd / m 2 ) of the laminate 1. ) Was measured using a color luminance meter “BM-5A” (manufactured by Topcon Corporation). The results are shown in Table 2.
（実施例２）
実施例１の紫外線反射層用組成物１に代えて紫外線反射層用組成物２を使用し、紫外線反射層（Ｂ−２）を成形した以外は、実施例１と同様に積層体２を作製し、同様の評価を実施した。結果を表２に示した。
(Example 2)
A laminated body 2 is produced in the same manner as in Example 1 except that the composition 2 for ultraviolet reflecting layer 2 is used in place of the composition 1 for ultraviolet reflecting layer of Example 1 and an ultraviolet reflecting layer (B-2) is formed. The same evaluation was conducted. The results are shown in Table 2.
（実施例３）
実施例１の紫外線反射層用組成物１に代えて紫外線反射層用組成物３を使用し、紫外線反射層（Ｂ−３）を成形した以外は、実施例１と同様に積層体３を作製し、同様の評価を実施した。結果を表２に示した。
(Example 3)
A laminated body 3 was produced in the same manner as in Example 1 except that the composition 3 for ultraviolet reflection layer was used in place of the composition 1 for ultraviolet reflection layer of Example 1 and an ultraviolet reflection layer (B-3) was formed. The same evaluation was conducted. The results are shown in Table 2.
（実施例４）
実施例１の紫外線反射層用組成物１に代えて紫外線反射層用組成物４を使用し、紫外線反射層（Ｂ−４）を成形した以外は、実施例１と同様に積層体４を作製し、同様の評価を実施した。結果を表２に示した。
Example 4
A laminated body 4 is produced in the same manner as in Example 1, except that the composition 4 for ultraviolet reflecting layer is used in place of the composition 1 for ultraviolet reflecting layer of Example 1 and an ultraviolet reflecting layer (B-4) is formed. The same evaluation was conducted. The results are shown in Table 2.
（実施例５）
実施例１の紫外線反射層用組成物１に代えて紫外線反射層用組成物５を使用し、紫外線反射層（Ｂ−５）を成形した以外は、実施例１と同様に積層体５を作製し、同様の評価を実施した。結果を表２に示した。
(Example 5)
A laminated body 5 is produced in the same manner as in Example 1 except that the composition 5 for ultraviolet reflection layer is used in place of the composition 1 for ultraviolet reflection layer of Example 1 and an ultraviolet reflection layer (B-5) is formed. The same evaluation was conducted. The results are shown in Table 2.
（実施例６）
ＰＥＴフィルム（３００ｍｍ×２００ｍｍ×０．１ｍｍ）の一方の面に、蛍光発光層用組成物１を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）で塗付、乾燥させ蛍光発光層（Ａ−１）を成形した。次いで、蛍光発光層（Ａ−１）とは反対側のＰＥＴフィルム一面に、紫外線反射層用組成物２を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、乾燥し紫外線反射層（Ｂ−２）を成形し、積層体６を得た。実施例１と同様の評価を実施した。結果を表６に示した。
(Example 6)
On one surface of a PET film (300 mm × 200 mm × 0.1 mm), the fluorescent light emitting layer composition 1 is applied with a coating thickness of 150 μm (dry film thickness is about 80 μm) and dried to obtain a fluorescent light emitting layer (A- 1) was molded. Next, the ultraviolet reflective layer composition 2 is applied to the entire surface of the PET film opposite to the fluorescent light emitting layer (A-1) so that the coating thickness is 150 μm (dry film thickness is about 80 μm), and then dried. The ultraviolet reflecting layer (B-2) was molded to obtain a laminate 6. Evaluation similar to Example 1 was implemented. The results are shown in Table 6.
（実施例７）
実施例６のＰＥＴフィルムに代えて、アクリル樹脂板（３００ｍｍ×２００ｍｍ×３ｍｍ）を用いた以外は、実施例５と同様に積層体７を作製し、同様の評価を実施した。結果を表２に示した。
(Example 7)
A laminated body 7 was prepared in the same manner as in Example 5 except that an acrylic resin plate (300 mm × 200 mm × 3 mm) was used instead of the PET film of Example 6, and the same evaluation was performed. The results are shown in Table 2.
（実施例８）
離型紙上に蛍光発光層用組成物１を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）で塗付し、乾燥させ蛍光発光層（Ａ−１）を成形した。次いで、蛍光発光層（Ａ−１）上に紫外線反射層用組成物２を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、乾燥し紫外線反射層（Ｂ−２）を成形し、積層体８を得た。得られた積層体に関して、実施例１と同様の評価を実施した。結果を表１に示した。
(Example 8)
The fluorescent light emitting layer composition 1 was applied on a release paper at a coating thickness of 150 μm (dry film thickness was about 80 μm) and dried to form a fluorescent light emitting layer (A-1). Next, the composition 2 for ultraviolet reflecting layer 2 is applied onto the fluorescent light emitting layer (A-1) so that the coating thickness is 150 μm (dry film thickness is about 80 μm), dried and the ultraviolet reflecting layer (B-2). Was molded to obtain a laminate 8. Evaluation similar to Example 1 was implemented about the obtained laminated body. The results are shown in Table 1.
（比較例１）
実施例１の紫外線反射層用組成物１に代えて紫外線反射層用組成物６を使用し、紫外線反射層（Ｂ−６）を成形した以外は、実施例１と同様に積層体９を作製し、同様の評価を実施した。結果を表２に示した。
(Comparative Example 1)
A laminated body 9 is produced in the same manner as in Example 1 except that the composition 6 for ultraviolet reflection layer is used in place of the composition 1 for ultraviolet reflection layer of Example 1 and an ultraviolet reflection layer (B-6) is formed. The same evaluation was conducted. The results are shown in Table 2.
（比較例２）
実施例１の紫外線反射層用組成物１に代えて紫外線反射層用組成物７を使用し、紫外線反射層（Ｂ−７）を成形した以外は、実施例１と同様に積層体１０を作製し、同様の評価を実施した。結果を表２に示した。
(Comparative Example 2)
A
（ブランク）
ガラス板（３００ｍｍ×２００ｍｍ×３ｍｍ）の一方の面に、蛍光発光層用組成物１を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、乾燥し蛍光発光層（Ａ−１）を成形したものを、上記の実施例１〜４、比較例１〜３の評価３〜４のブランクとした。
(blank)
On one surface of a glass plate (300 mm × 200 mm × 3 mm), the fluorescent light emitting layer composition 1 is applied to a thickness of 150 μm (dry film thickness is about 80 μm), dried, and then the fluorescent light emitting layer (A -1) was formed into blanks of evaluations 3 to 4 in Examples 1 to 4 and Comparative Examples 1 to 3 described above.
次に、蛍光発光層（Ａ）が２層からなる積層体を製造した。
（実施例９）
実施例１の積層体１に対して、紫外線反射層（Ｂ−１）の上に蛍光発光層用組成物２を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、乾燥させ、蛍光発光層（Ａ−２）を成形し、積層体１１を得た。
得られた積層体１１に関して、蛍光発光層（Ａ−１）、蛍光発光層（Ａ−２）から３ｃｍの距離にそれぞれ紫外線光源（Ｄ−１）、紫外線光源（Ｄ−２）（ともに６Ｗ紫外線ランプ：３６５ｎｍ）を設置し、暗室中で紫外線を照射し、積層体１１を発光させた。（Ｄ−１）ＯＮ／（Ｄ−２）ＯＦＦの場合は蛍光発光層（Ａ−１）の緑色、（Ｄ−１）ＯＦＦ／（Ｄ−２）ＯＮの場合は蛍光発光層（Ａ−２）の赤色、また、（Ｄ−１）ＯＮ／（Ｄ−２）ＯＮの場合は、緑色と赤色の発光の混色である黄色に発光し、２つの光源のＯＮ／ＯＦＦの組み合わせにより、積層体１１の発光色が変化することが確認された。
また、実施例１と同様の方法により積層体Ｘの輝度を評価したところ、Ｄ−１のみがＯＮの場合２６．０ｃｄ／ｍ２、Ｄ−２のみがＯＮの場合２５．１ｃｄ／ｍ２、及びＤ−１、Ｄ−２ともにＯＮの場合５０．５ｃｄ／ｍ２であった。
Next, a laminate having two fluorescent emission layers (A) was produced.
Example 9
Applying the fluorescent light emitting layer composition 2 on the ultraviolet reflective layer (B-1) to the laminate 1 of Example 1 so that the coating thickness is 150 μm (dry film thickness is about 80 μm), It was made to dry and the fluorescence light emitting layer (A-2) was shape | molded, and the laminated body 11 was obtained.
With respect to the obtained laminate 11, the ultraviolet light source (D-1) and the ultraviolet light source (D-2) (both 6W ultraviolet light) were placed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and the fluorescent light emitting layer (A-2). Lamp: 365 nm) was installed, and ultraviolet rays were irradiated in the dark room to cause the laminate 11 to emit light. In the case of (D-1) ON / (D-2) OFF, the green color of the fluorescent light emitting layer (A-1), and in the case of (D-1) OFF / (D-2) ON, the fluorescent light emitting layer (A-2) ) Red, or (D-1) ON / (D-2) ON, light is emitted in yellow, which is a mixed color of green and red light emission, and a laminate is obtained by combining ON / OFF of two light sources. 11 emission colors were confirmed to change.
Moreover, when the brightness | luminance of the laminated body X was evaluated by the method similar to Example 1, when only D-1 is ON, 26.0 cd / m < 2 >, when only D-2 is ON, 25.1 cd / m < 2 >, And when both D-1 and D-2 were ON, it was 50.5 cd / m 2 .
（実施例１０）
ガラス板（３００ｍｍ×２００ｍｍ×３ｍｍ）の両面にそれぞれ紫外線反射層用組成物２を塗付厚が１５０μｍ（乾燥膜厚が約８０μｍ）となるように塗付、乾燥させて紫外線反射層（Ｂ−２）、（Ｂ−２’）を成形した。次いで、一方の面の紫外線反射層（Ｂ−２）上に蛍光発光層用組成物１を塗付厚が１５０μｍ（乾燥膜厚が約７５μｍ）となるように塗付、乾燥させ、蛍光発光層（Ａ−１）を成形した。さらに、もう一方の面の紫外線反射層（Ｂ−２’）上に蛍光発光層用組成物２を蛍光発光層用組成物１と同様に塗付して蛍光発光層（Ａ−２）を成形し、積層体１２を得た。
得られた積層体１２に関して、実施例９と同様に発光させたところ、（Ｄ−１）ＯＮ／（Ｄ−２）ＯＦＦの場合は蛍光発光層（Ａ−１）の緑色、（Ｄ−１）ＯＦＦ／（Ｄ−２）ＯＮの場合は蛍光発光層（Ａ−２）の赤色、また、（Ｄ−１）ＯＮ／（Ｄ−２）ＯＮの場合は黄色に発光し、２つの光源のＯＮ／ＯＦＦの組み合わせにより、積層体Ｙの発光色が変化することが確認された。
また、実施例１と同様の方法により積層体１２の輝度を評価したところ、Ｄ−１のみがＯＮの場合２８．０ｃｄ／ｍ２、Ｄ−２のみがＯＮの場合２５．２ｃｄ／ｍ２、及びＤ−１、Ｄ−２ともにＯＮの場合５１．７ｃｄ／ｍ２であった。
(Example 10)
The ultraviolet reflective layer composition 2 was applied to both surfaces of a glass plate (300 mm × 200 mm × 3 mm) so that the coating thickness was 150 μm (dry film thickness was about 80 μm), and the ultraviolet reflective layer (B- 2) and (B-2 ′) were molded. Next, the composition for fluorescent light emitting layer 1 is applied on the ultraviolet reflective layer (B-2) on one side so that the coating thickness is 150 μm (the dry film thickness is about 75 μm), and is dried. (A-1) was molded. Further, the fluorescent light emitting layer composition 2 is applied onto the ultraviolet reflective layer (B-2 ′) on the other surface in the same manner as the fluorescent light emitting layer composition 1 to form the fluorescent light emitting layer (A-2). As a result, a laminate 12 was obtained.
When the obtained laminate 12 was caused to emit light in the same manner as in Example 9, when (D-1) ON / (D-2) OFF, the green color of the fluorescent light emitting layer (A-1), (D-1 ) When OFF / (D-2) is ON, the fluorescent light emitting layer (A-2) is red, and when (D-1) ON / (D-2) is ON, it emits yellow. It was confirmed that the emission color of the laminate Y changes depending on the ON / OFF combination.
In Examples 1 and was evaluated for brightness of the laminate 12 in the same manner, if only D-1 is only when the ON 28.0cd / m 2, D- 2 is ON 25.2cd / m 2, And D-1 and D-2 were both 51.7 cd / m 2 when ON.
Claims (6)
紫外線が照射される側に蛍光発光を示す蛍光発光層（Ａ）、
紫外線が照射される側と反対側に、半透明で、かつ波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）、
が積層され、
上記紫外線反射層（Ｂ）が、紫外線反射性粉体と透光性材料を含み、
上記紫外線反射性粉体が、３００ｎｍ〜４００ｎｍでの紫外線反射率が５０％以上、屈折率が１．５〜２．４であることを特徴とする積層体。 A laminate that emits light when irradiated with an ultraviolet light source,
A fluorescent light emitting layer (A) showing fluorescent light emission on the side irradiated with ultraviolet rays,
On the side opposite to the side irradiated with ultraviolet rays, the ultraviolet reflecting layer (B) which is translucent and has an ultraviolet reflectance of 25% or more in a wavelength region of 300 nm to 400 nm,
Are stacked,
The ultraviolet reflective layer (B) includes an ultraviolet reflective powder and a translucent material,
The laminate according to claim 1, wherein the ultraviolet reflective powder has an ultraviolet reflectance at 300 nm to 400 nm of 50% or more and a refractive index of 1.5 to 2.4.
蛍光発光を示す蛍光発光層（Ａ１）、半透明で、かつ波長領域３００ｎｍ〜４００ｎｍでの紫外線反射率が２５％以上である紫外線反射層（Ｂ）、及び蛍光発光を示す蛍光発光層（Ａ２）が積層され、
上記紫外線反射層（Ｂ）が、紫外線反射性粉体と透光性材料を含み、
上記紫外線反射性粉体が、３００ｎｍ〜４００ｎｍでの紫外線反射率が５０％以上、屈折率が１．５〜２．４であることを特徴とする積層体。 A laminate that emits light when irradiated with an ultraviolet light source,
Fluorescent-emitting layer showing fluorescence emission (A1), a semi-transparent and UV-reflecting layer UV reflectance in the wavelength region 300nm~400nm is 25% or more (B), and fluorescent-emitting layer showing fluorescence emission (A2) Are stacked ,
The ultraviolet reflective layer (B) includes an ultraviolet reflective powder and a translucent material,
The laminate according to claim 1, wherein the ultraviolet reflective powder has an ultraviolet reflectance at 300 nm to 400 nm of 50% or more and a refractive index of 1.5 to 2.4.
6. A light emitting structure comprising: the laminate according to claim 4 or 5; and an ultraviolet light source (D) on the fluorescent light emitting layer (A1) and / or fluorescent light emitting layer (A2) side of the laminate. .
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