Light conversion element containing ionic liquid, a process for making same, and an apparatus comprising the light conversion element
AssigneeTokyo Institute of Technology
InventorsYoichi Murakami, Isao Satoh
Life of this patent
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Abstract
To provide a light conversion element which has solved the problems of the reduced intensity of upconverted light, etc., due to the flammability, volatility or high viscosity of a medium used in the conventional photon upconversion elements. A light conversion element is provided which has solved the above problems by using a visually homogeneous and transparent light conversion element, wherein organic photosensitizing molecules and organic light-emitting molecules, which are a combination that exhibits a triplet-triplet annihilation process, are dissolved and/or dispersed in an ionic liquid.
Claims17
A visually homogeneous and transparent light conversion element, wherein organic photosensitizing molecules and organic light-emitting molecules, which are a combination that exhibits a triplet-triplet annihilation process, are dissolved and/or dispersed in an ionic liquid.
A method for producing a visually homogeneous and transparent light conversion element, said method comprising the steps of:
- a) forming an organic solution or organic solutions in which organic photosensitizing molecules and organic light-emitting molecules, which are a combination that exhibits a triplet-triplet annihilation process, are dissolved in a volatile organic solvent or volatile organic solvents,
- b) mixing an ionic liquid with said volatile organic solution(s) by stirring to form a visually homogeneous and transparent solution and/or dispersion, and
- c) removing the volatile organic solvent(s) under reduced pressure from said solution and/or said dispersion to a trace amount or less.
Dependencies are inferred from the claim text.