Optical memory device
First Claim
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1. An optical memory device comprising:
- a luminous material comprising luminous nanoparticles which increase and/or memorize a photoluminescence intensity as a function of irradiation energy of excitation light wherein an organic compound comprising at least one element selected from the group consisting of P, N, and S is present on at least a portion of the surface of each luminous nanoparticle, and the quantity of the organic compound is 1 to 50 wt. % with respect to the weight of the luminous nanoparticles.
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Abstract
An optical memory device comprising a luminous material capable of increasing and/or memorizing a photoluminescence intensity (hereinafter referred to as a “luminous intensity”) as a function of irradiation energy of excitation light. And the luminous material comprises nanoparticles, diameters of which are smaller than Bohr radius of the luminous material so that excitons generated in the nanoparticles undergo quantum containment state in which the electrons and holes are individually contained as a result of irradiation with excitation light.
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Citations
39 Claims
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1. An optical memory device comprising:
a luminous material comprising luminous nanoparticles which increase and/or memorize a photoluminescence intensity as a function of irradiation energy of excitation light wherein an organic compound comprising at least one element selected from the group consisting of P, N, and S is present on at least a portion of the surface of each luminous nanoparticle, and the quantity of the organic compound is 1 to 50 wt. % with respect to the weight of the luminous nanoparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 34, 35, 36, 37, 38, 39)
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20. A nanoparticle thin film manufacturing method comprising forming on a solid substrate a thin film from nanoparticles capable of increasing, or increasing and memorizing, photoluminescence as a function of irradiation time of excitation light or as a function of the dose of excitation light, wherein
the solid substrate is coated by spin coating a suspension formed by suspending nanoparticles in a solvent, while rotating the solid substrate at a speed of 500 rpm or more for 1 minute or more.
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27. A nanoparticle thin film manufacturing method of forming on a solid substrate a thin film comprising nanoparticles capable of increasing, or increasing and memorizing, a luminous intensity as a function of irradiation time of excitation light or as a function of the dose of excitation light, wherein
the solid substrate is ink-jet coated with a dispersed solution formed by dispersing nanoparticles in an emulsion whose continuous phase comprises water and whose dispersed phase is an oily phase.
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30. A photoluminescence erasing method, wherein
after the luminous intensity of an optical memory device— - which includes luminous nanoparticles capable of increasing, or increasing and memorizing, a luminous intensity as a function of irradiation time of excitation light or as a function of the dose of excitation light—
has been increased, or increased and memorized, the optical memory device is subjected to heat treatment, thereby diminishing the luminous intensity. - View Dependent Claims (31)
- which includes luminous nanoparticles capable of increasing, or increasing and memorizing, a luminous intensity as a function of irradiation time of excitation light or as a function of the dose of excitation light—
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32. An integrating optical sensor comprising:
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a thin film including luminous nanoparticles capable of increasing, or increasing and memorizing, a luminous intensity as a function of irradiation time of excitation light or as a function of the dose of excitation light; and
a mask including a region which is exposed to light to be measured and a region which is not exposed to the light. - View Dependent Claims (33)
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Specification