A luminescent optical device, comprising an optical substrate that provides a wave guide, and an illuminating ink composition are disclosed. The device comprises a cured layer of said ink composition at an interface of said waveguide, substantially comprising a polymer matrix and a luminescence agent that is dispersed in said polymer matrix. The ink composition comprises a polymerizable acrylate compound, particularly a poly-di-acrylate matrix, preferably a poly-glycol di-acrylate matrix. The ink composition further contains a polymerization initiator that is configured and capable of releasing free radicals during polymerization of said acrylate compound and a polymerization promoter that comprises a thiol compound.

A display device includes a light source irradiating excitation light and a window glass for a vehicle, such as a windshield, capable of emitting visible light through incident radiation of the excitation light, and allows the window glass for a vehicle to emit the light so as to display a message toward an outside of the vehicle by irradiation with the excitation light.

A display device includes a light source irradiating excitation light and a window glass for a vehicle, such as a windshield, capable of emitting visible light through incident radiation of the excitation light, and allows the window glass for a vehicle to emit the light so as to display a message toward an outside of the vehicle by irradiation with the excitation light.

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.

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.

A safety switch includes a detection unit, an output unit, an input unit; and a display unit. The detection unit is configured to detect presence or absence of abnormality. The output unit is configured to output an abnormality detection signal indicating a detection result of the presence or absence of the abnormality. The input unit is configured to input a display control signal. The display unit is configured to perform display based on the display control signal.

An organic long-persistent luminescent composition containing a first organic compound, a second organic compound and a third organic compound and satisfying the following expression (1) is a long-persistent luminescent material that facilitates emission color control. E.sub.S1(A) represents a lowest excited singlet energy level of emission from the first organic compound and the second organic compound, E.sub.S1(B) represents a lowest excited singlet energy level of the third organic compound.
E.sub.S1(B)−E.sub.S1(A)≤0.15 eV  (1)

An organic long-persistent luminescent composition containing a first organic compound, a second organic compound and a third organic compound and satisfying the following expression (1) is a long-persistent luminescent material that facilitates emission color control. E.sub.S1(A) represents a lowest excited singlet energy level of emission from the first organic compound and the second organic compound, E.sub.S1(B) represents a lowest excited singlet energy level of the third organic compound.
E.sub.S1(B)−E.sub.S1(A)≤0.15 eV  (1)

A tactile indicator 200 for use in an aerosol provision system 300. The tactile indicator 200 may be supplied with a given aerosol provision system 1, or may be retrospectively used with, or attached to, an aerosol provision device 2. The tactile indicator 200 may be electrically operated, or may be mechanically operated and/or configured to remain stationary in use. The tactile indicator 200 may therefore facilitate the operation of an aerosol provision system 1, particularly to those users which have a visual impairment.

The invention relates to an area light decorative element (1) comprising an optically activatable symbol body (2) at least partially formed of a transparent optically activatable first material (9) and configured to emit visible light in response to the optically activatable symbol body (2) being excited with electromagnetic radiation in a predetermined first frequency range, a light element (3) consisting of a transparent material, wherein the optically activatable symbol body (2) is arranged in the light element (3), a touch-sensitive surface (4) disposed in a first area (5) of a surface of the light element (3) above the optically activatable symbol body (2) for detecting a touch of a user in the first area (5), and an illumination unit (6) which is arranged to emit visible light in a predetermined visible frequency range (22) into the light element (3) and, together with the visible light, also to emit electromagnetic radiation in the predetermined first frequency range into the light element (3).