Luminous curved glass and curved digital signage

Abstract

The present invention aims to provide a luminescent curved glass which, despite being curved with a small radius of curvature, can provide a clear display on its entire surface when irradiated with light, and curved digital signage including the luminescent curved glass. Provided is a luminescent curved glass including a laminate including a transparent plate having a radius of curvature of 3,000 mm or lower and a luminescent sheet, the luminescent sheet containing a thermoplastic resin and a luminescent material that emits visible light having a wavelength of 380 to 750 nm under excitation light.

Claims

1. A luminescent curved glass comprising a laminate including a transparent plate having a thickness of 1.5 mm to 15 mm and a radius of curvature of 3,000 mm or lower, and a luminescent sheet, wherein the luminescent sheet contains a thermoplastic resin, a luminescent material that emits visible light having a wavelength of 380 to 750 nm under excitation light, and a plasticizer, the thermoplastic resin is a polyvinyl acetal resin and/or an ethylene-vinyl acetate copolymer resin, and an amount of the luminescent material in the luminescent sheet is 0.001 parts by weight or more and 10 parts by weight or less relative to 100 parts by weight of the thermoplastic resin.

2. The luminescent curved glass according to claim 1, wherein the transparent plate has a radius of curvature of 2,000 mm or lower.

3. The luminescent curved glass according to claim 1, wherein the transparent plate has a radius of curvature of 1,000 mm or lower.

4. The luminescent curved glass according to claim 1, wherein the laminate includes a pair of the transparent plates and the luminescent sheet interposed between the transparent plates.

5. A curved digital signage comprising: a light source; and the luminescent curved glass according to claim 1.

6. The curved digital signage according to claim 5, wherein the laminate in the luminescent curved glass includes a pair of the transparent plates and the luminescent sheet interposed between the transparent plates.

7. A building comprising the curved digital signage according to claim 5.

8. A pillar of a building, the pillar comprising the curved digital signage according to claim 5.

9. The luminescent curved glass according to claim 1, wherein an amount of the plasticizer in the luminescent sheet is 30 parts by weight or more and 100 parts by weight or less relative to 100 parts by weight of the thermoplastic resin.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic view illustrating a method for displaying character information in evaluation of examples and comparative examples.

DESCRIPTION OF EMBODIMENTS

(2) The present invention is more specifically described in the following with reference to, but not limited to, examples.

Example 1

(3) (1) Preparation of Eu(TFA).sub.3phen

(4) Europium acetate (Eu(CH.sub.3C00).sub.3) in an amount of 12.5 mmol was dissolved in 50 mL of distilled water. To the solution was added 33.6 mmol of trifluoroacetylacetone (TFA, CH.sub.3COCH.sub.2COCF.sub.3), and the mixture was stirred at room temperature for 3 hours. The mixture was filtered to obtain precipitated solid. The precipitated solid was washed with water, and recrystallized using methanol and distilled water to give Eu(TFA).sub.3(H.sub.2O).sub.2. Then, 5.77 g of the resulting complex (Eu(TFA).sub.3(H.sub.2O).sub.2) and 2.5 g of 1,10-phenanthroline (phen) were dissolved in 100 mL of methanol, followed by heating under reflux for 12 hours. After 12 hours, methanol was distilled off under reduced pressure, thereby obtaining a white product. The white product powder was washed with toluene so that unreacted materials were removed by suction filtration. Subsequently, toluene was distilled off under reduced pressure, thereby preparing a powder. Through recrystallization using a solvent mixture of toluene and hexane, Eu(TFA).sub.3phen was obtained.

(5) (2) Preparation of Luminescent Sheet

(6) To 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) as a plasticizer were added 0.2 parts by weight of Eu(TFA).sub.3phen as a luminescent material and acetylacetone magnesium in an amount giving a final concentration of 0.036 phr as an adhesion modifier, whereby a luminescent plasticizer solution was prepared. The entire amount of the plasticizer solution obtained and 100 parts by weight of polyvinyl butyral (PVB, degree of polymerization: 1700) were sufficiently mixed and kneaded using a mixing roll to prepare a resin composition.

(7) The obtained resin composition was extruded using an extruder to provide a luminescent sheet having a thickness of 760 μm.

(8) (3) Production of Luminescent Curved Glass

(9) The obtained luminescent sheet was interposed between a pair of clear glass plates (thickness: 2.5 mm, curved with a radius of curvature of 3,000 mm) to prepare a laminate. The laminate was pressed under vacuum at 90° C. for 30 minutes to be press-bonded using a vacuum laminator. The press-bonded laminate was subjected to another 20-minute press-bonding under 14 MPa at 140° C. using an autoclave, thereby obtaining a luminescent curved glass having a laminated glass structure.

Example 2

(10) A luminescent sheet and a luminescent curved glass were produced as in Example 1 except that a pair of clear glass plates each having a thickness of 2.5 mm and a radius of curvature of 2,000 mm was used.

Example 3

(11) A luminescent sheet and a luminescent curved glass were produced as in Example 1 except that a pair of clear glass plates each having a thickness of 2.5 mm and a radius of curvature of 1,000 mm was used.

Example 4

(12) Terbium acetate (Tb(CH.sub.3COO).sub.3) in an amount of 12.5 mmol was dissolved in 50 mL of distilled water. To the solution was added 33.6 mmol of trifluoroacetylacetone (TFA, CH.sub.3COCH.sub.2COCF.sub.3), and the mixture was stirred at room temperature for 3 hours. The mixture was filtered to obtain precipitated solid, and the precipitated solid was washed with water, and recrystallized using methanol and distilled water to give Tb(TFA).sub.3(H.sub.2O).sub.2. Then, 5.77 g of the resulting complex (Tb(TFA).sub.3(H.sub.2O).sub.2) and 2.5 g of 1,10-phenanthroline (phen) were dissolved in 100 mL of methanol, followed by heating under reflux for 12 hours. After 12 hours, methanol was distilled off under reduced pressure, thereby obtaining a white product. The white product powder was washed with toluene and unreacted materials were removed by suction filtration. Subsequently, toluene was distilled off under reduced pressure, thereby preparing a powder. Through recrystallization using a solvent mixture of toluene and hexane, Tb(TFA).sub.3phen was obtained.

(13) A luminescent sheet and a luminescent curved glass were produced as in Example 1 except that Tb(TFA).sub.3phen was used instead of Eu(TFA).sub.3phen.

Example 5

(14) A luminescent sheet and a luminescent curved glass were produced as in Example 1 except that diethyl-2,5-dihydroxyterephthalate (available from Sigma-Aldrich, “diethyl 2,5-dihydroxyterephthalate”) was used instead of Eu(TFA).sub.3phen.

Comparative Example 1

(15) A resin sheet and a curved glass were produced as in Example 1 except that no luminescent material was used.

(16) (Evaluation)

(17) The luminescent curved glasses obtained in the examples and comparative examples were evaluated by the following methods.

(18) Table 1 shows the results.

(19) As shown in FIG. 1, each of the luminescent curved glasses obtained in the examples was irradiated with light having a wavelength of 405 nm and an output power of 1 mW from the side of the center point of the curved surface using an image projector (available from Opus Microsystems Corp., ePro-2000) as an excitation light source. The luminescent material was thus allowed to emit light to display “A” characters on nine sites as character information.

(20) Separately, the curved glass obtained in Comparative Example 1 was irradiated with green light having a wavelength of 515 nm from the side of the center point of the curved surface using an image projector (available from Opus Microsystems Corp., ePro-2000), so that the curved glass displayed “A” characters on nine sites as character information.

(21) Each “A” character was visually observed. A rating of “∘ (Good)” was given when less than five “A” characters were distorted. A rating of “x (Poor)” was given when five or more “A” characters were distorted.

(22) TABLE-US-00001 TABLE 1 Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 1 Luminescent PVB phr 100 100 100 100 100 100 sheet 3GO phr 40 40 40 40 40 40 formulation Luminescent Eu(TFA).sub.3phen phr 0.2 0.2 0.2 — — — material Tb(TFA).sub.3phen phr — — — 0.2 — — Diethyl 2,5- phr — — — — 0.2 — dihydroxyterephthalate Adhesion Acetylacetone phr 0.036 0.036 0.036 0.036 0.036 0.036 modifier magnesium Radius of curvature of transparent plate mm 3000 2000 1000 3000 3000 3000 Evaluation Distortion of character information — ◯ ◯ ◯ ◯ ◯ X

INDUSTRIAL APPLICABILITY

(23) The present invention can provide a luminescent curved glass which, despite being curved with a small radius of curvature, can provide a clear display on its entire surface when irradiated with light, and curved digital signage including the luminescent curved glass.