NZ725987A0 - A photoluminescent sign, light source and method of use - Google Patents
A photoluminescent sign, light source and method of useInfo
- Publication number
- NZ725987A0 NZ725987A0 NZ725987A NZ72598716A NZ725987A0 NZ 725987 A0 NZ725987 A0 NZ 725987A0 NZ 725987 A NZ725987 A NZ 725987A NZ 72598716 A NZ72598716 A NZ 72598716A NZ 725987 A0 NZ725987 A0 NZ 725987A0
- Authority
- NZ
- New Zealand
- Prior art keywords
- light
- irradiating means
- light source
- permeable material
- sign
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract 75
- 230000001678 irradiating Effects 0.000 claims abstract 31
- 230000005284 excitation Effects 0.000 claims 5
- 238000004020 luminiscence type Methods 0.000 claims 5
- 230000001443 photoexcitation Effects 0.000 claims 2
- 240000003380 Passiflora rubra Species 0.000 claims 1
- 210000003491 Skin Anatomy 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 1
- 238000000149 argon plasma sintering Methods 0.000 claims 1
- 210000000007 bat wing Anatomy 0.000 claims 1
- 239000011521 glass Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005457 optimization Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
Abstract
Described herein is a PL sign, light source and methods of use comprising a PL material, a light permeable material at least partially coplanar with the PL material and a gap between the two, an irradiating means between the gap that excites the PL material and in the event of a disruption to the irradiating means, the PL material luminesces for sufficient time to illuminate the light source or sign. The particular design described may be useful to avoid art problems with similar devices. radiating means, the PL material luminesces for sufficient time to illuminate the light source or sign. The particular design described may be useful to avoid art problems with similar devices.
Claims (27)
- WHAT IS CLAIMED IS: 1. A light source comprising: photo-luminescent (PL) material; a light permeable material with a PL material facing side and an outwards facing side, the light permeable material being at least partially co-planar with the PL material; a gap between the PL material and the light permeable material; at least one integrated irradiating means located within the gap, the at least one irradiating means directing PL excitation wavelengths energy towards the PL material.
- 2. The light source as claimed in claim 1 wherein the PL material is a mixture of a thermoplastic polymer and PL that forms a homogenous planar surface or skin.
- 3. The light source as claimed in claim 1 or claim 2 wherein light emitted from the PL material passes through the light permeable material when the PL material luminesces.
- 4. The light source as claimed in any one of the above claims wherein the light permeable material is a planar surface.
- 5. The light source as claimed in any one of the above claims wherein the light permeable material is selected from acrylic or glass.
- 6. The light source as claimed in any one of the above claims wherein the light permeable material is located in front of and fully covers the PL material.
- 7. The light source as claimed in any one of the above claims wherein the gap is sufficiently large to optimise at least one characteristic selected from: a) light spread from the at least one irradiating means to the PL material so that irradiation causes even PL photo-excitation and emission; b) light spread from the at least one irradiating means to the PL material so that irradiation maximises PL emission brightness; c) light spread from the at least one irradiating means to the PL material so that energy use is minimised for a desired level of luminescence; d) light spread from the at least one irradiating means to the PL material so that irradiation maximises saturation of the PL and hence minimises PL material re-excitation time; and/or e) the number of irradiating means required to achieve a desired level of luminescence is minimised.
- 8. The light source as claimed in any one of the above claims wherein the gap is at least 5mm wide.
- 9. The light source as claimed in any one of the above claims wherein the irradiating means is located on the PL material facing side of the light permeable material.
- 10. The light source as claimed in any one of the above claims wherein the irradiating means emits wavelengths in the range 250-700nm.
- 11. The light source as claimed in any one of the above claims wherein the irradiating means is at least one LED light source emitting white light at 2000-8000K.
- 12. The light source as claimed in any one of the above claims wherein the beam angle of the irradiating means is selected based on optimization of the quantity and location of the irradiating means, and their intensity.
- 13. The light source as claimed in any one of claims 1 to 11 wherein the irradiating means lies normal to the PL material.
- 14. The light source as claimed in any one of the above claims wherein the irradiating means directs light to the PL material in a batwing distribution.
- 15. The light source as claimed in any one of the above claims wherein the PL material is applied to a backing material.
- 16. The light source as claimed in any one of the above claims wherein, in use, the PL material absorbs photons from the at least one irradiating means and, in the event of a disruption to the at least one irradiating means, the PL material then luminesces.
- 17. The light source as claimed in claim 16 wherein, in the event of a power failure, the PL luminesces with a luminance of at least 20mcd/m for at least 30 minutes across the whole PL material.
- 18. The light source as claimed in claim 16 or claim 17 wherein, post luminescence, the PL recharges, on application of PL excitation wavelength electromagnetic energy, within at least 1 minute.
- 19. A sign to highlight indicia thereon, the sign comprising: photo-luminescent (PL) material; a light permeable material with a PL material facing side and an outwards facing side, the light permeable material being at least partially co-planar with the PL material; a gap between the PL material and the light permeable material; at least one integrated irradiating means located within the gap, the at least one irradiating means directing PL excitation wavelengths energy towards the PL material; and at least one indicia located on, or in, the outwards facing side of the light permeable material.
- 20. The sign as claimed in claim 19 wherein the indicia is or are: (a) adhered to the light permeable material surface; (b) screen printed onto the light permeable material surface; and/or (c) embedded into the light permeable material surface.
- 21. The sign as claimed in claim 19 or claim 20 wherein the underside of the indicia facing the PL layer is reflective.
- 22. The sign as claimed in any one of claims 19 to 21 wherein the at least one irradiating means is located on the light permeable material at a point obscured by the indicia on the outwards facing side of the light permeable material.
- 23. A sign to highlight indicia thereon, the sign comprising: photo-luminescent (PL) material; a light permeable material with a PL material facing side and an outwards facing side, the light permeable material being at least partially co-planar with the PL material; a gap between the PL material and the light permeable material; at least one integrated irradiating means located within the gap, the at least one irradiating means directing PL excitation wavelengths energy towards the PL material; and wherein the PL material itself is shaped as at least one indicia.
- 24. The sign as claimed in any one of claims 19 to 23 wherein the indicia is or are one or more characters, symbols or shapes.
- 25. The sign as claimed in any one of claims 19 to 24 wherein, in use, the PL material absorbs photons from the at least one irradiating means and, in the event of a disruption to the at least one irradiating means, the PL material then luminesces.
- 26. The sign as claimed in any one of claims 19 to 25 wherein a light scattering surface or surface preparation is applied to the light permeable material.
- 27. A method of optimising the emitted light from a photo-luminescent (PL) material, the method comprising: (a) providing a PL material at least partially in a co-planar arrangement with a light permeable material, the PL material and light permeable material being spaced apart with at least one irradiating means being located within the spacing and directing PL excitation wavelength energy towards the PL material; - (b) varying the spacing between the PL material and light permeable material sufficient to optimise one or more characteristics selected from: (i) light spread from the at least one irradiating means to the PL material so that irradiation causes even PL photo-excitation and emission; (ii) light spread from the at least one irradiating means to the PL material so that irradiation maximises PL emission brightness; (iii) light spread from the at least one irradiating means to the PL material so that energy use is minimised for a desired level of luminescence; (iv) light spread from the at least one irradiating means to the PL material so that irradiation maximises saturation of the PL and hence minimises PL material re-excitation time; and/or (v) the number of irradiating means required to achieve a desired level of luminescence is minimised. 30. A light source substantially as hereinbefore described with reference to Example 1 or Example 2 and
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ725987A0 true NZ725987A0 (en) |
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