Photoluminescent light emitter with enhanced photometric...

F - Mech Eng,Light,Heat,Weapons – 21 – K

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F21K 2/00 (2006.01) G09F 13/20 (2006.01)

Patent

CA 2311454

A photoluminescent light emitter has higher surface luminance and lumimous exitance characteristics as compared with those of current photoluminescent light emitters. The light emitter may be implemented without the use of refractive elements and has high surface luminance characteristics in substantially all viewing directions. This performance is accomplished by substantially increasing the effective surface area of the photoluminescent material from which the reradiated light is emitted through controlled texturing of the exposed photoluminescent surface. Photoluminescent material with a textured surface emits a portion of light that is incident upon the surface and does not propagate immediately into the environment. Upon reflection by the textured surface, this light is added to the emitted light and thereby increases the measurable luminance of the exposed photoluminescent surface. Certain embodiments take advantage of the self-excitation properties of certain photoluminescent pigments in which the spectrum of the emitted light overlaps the spectrum of the excitation light. Some of the emitted light incident upon the textured surface is absorbed rather than reflected. Of this light, some of its energy excites the photoluminescent pigments rather than being converted to thermal heat energy. This absorbed energy is later reradiated as light within the emission spectrum of the pigments, thereby further increasing the overall luminous exitance of the photoluminescent materials.

Emetteur de lumière photoluminescent qui possède une luminance de surface et une exitance lumineuse plus élevées par comparaison à celles des émetteurs de lumière photoluminescents actuels. Ledit émetteur de lumière peut être mis en oeuvre sans utilisation d'éléments de réfraction et possède des caractéristiques de luminance de surface élevées dans pratiquement toutes les directions de vision. On parvient à ce résultat en augmentant pratiquement la superficie effective de la matière photoluminescente qui réémet la lumière par un texturage régulé de la surface photoluminescente exposée. Une partie de la lumière émise par la matière photoluminescente à surface texturée est incidente sur la surface et ne se propage pas immédiatement dans l'environnement. Après réflexion par la surface texturée, cette lumière s'ajoute à la lumière émise et augmente ainsi la luminance mesurable de la surface photoluminescente exposée. Dans certains modes de réalisation, on tire profit des propriétés d'auto-excitation de certains pigments photoluminescents pour lesquels le spectre de la lumière émise chevauche le spectre de la lumière d'excitation. Une partie de la lumière émise incidente sur la surface texturée est absorbée plutôt que réfléchie. Une certaine partie de l'énergie de cette lumière excite les pigments photoluminescents plutôt que d'être convertie en énergie thermique. Cette énergie absorbée est ensuite réémise en tant que lumière dans le spectre d'émission des pigments, ce qui augmente encore l'exitance lumineuse totale des matières photoluminescentes.

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