TWI839279B - Fish tank - Google Patents

Abstract

A fish tank includes a water tank, a lighting device, a first solar panel, a second solar panel, a power distribution control unit, and a storage battery. A lighting device irradiates light into the water tank. The lighting device includes a lampshade and a lamp tube. The lamp tube is arranged inside the lampshade. A first solar panel is arranged on the outer surface of the lampshade. A second solar panel is arranged on the inner surface of the lampshade. A power distribution control unit is electrically connected to the first solar panel, the second solar panel, and the lighting device. A storage battery is electrically connected to the power distribution control unit.

Description

Fish Tank

The present disclosure relates to a fish tank, and more particularly to a fish tank with a lighting device.

With the development of urbanization, technology and humanization, people's living standards have improved, and more and more consumers pay more attention to the quality of life and the beauty of their homes. Fish farming has gradually become a trend, and the use of fish tanks has also increased. Fish tanks placed in indoor environments need a light source that can replace sunlight. The light source can make the water transparent and clear for viewing, and at the same time enable aquatic plants to photosynthesize and promote their growth and development.

However, since the light source of the fish tank needs to be turned on for a long time, it consumes a lot of electricity. In the current global energy shortage, all walks of life are promoting energy conservation. Therefore, how to develop a fish tank that can save electricity and energy is an urgent problem that the industry needs to solve.

The present disclosure provides a fish tank, including: a water tank, a lighting device, a first solar panel, a second solar panel, a power distribution control unit and a storage battery. The lighting device irradiates light to the water tank. The lighting device includes a lampshade and a lamp tube, and the lamp tube is arranged inside the lampshade. The first solar panel is arranged on the outer surface of the lampshade. The second solar panel is arranged on the inner surface of the lampshade. The power distribution control unit is electrically connected to the first solar panel, the second solar panel and the lighting device. The storage battery is electrically connected to the power distribution control unit.

In some embodiments, the fish tank further includes an external power source electrically connected to the power distribution control unit.

In some embodiments, the first solar panel surrounds the outer surface of the lampshade.

In some embodiments, the second solar panel surrounds the inner surface of the lampshade.

In some embodiments, the lampshade includes a circular tube type and a rectangular tube type.

In some embodiments, the light tube includes a plurality of three-primary-color light-emitting diodes.

In some embodiments, the first solar panel and the second solar panel each include a calcium-titanium solar panel.

In some embodiments, the calcium-titanium solar panel includes a metal electrode layer, a hole transport layer, a calcium-titanium layer, an electron transport layer, and a transparent electrode layer arranged in sequence. The metal electrode layer is closest to the outer surface or the inner surface of the lampshade.

In some embodiments, the calcium-titanium solar panel includes a metal electrode layer, an electron transport layer, a calcium-titanium layer, a hole transport layer, and a transparent electrode layer arranged in sequence. The metal electrode layer is closest to the outer surface or the inner surface of the lampshade.

In some embodiments, the calcium titanate solar panel includes a metal electrode layer, a hole transport layer, a calcium titanate layer, a dense layer, and a transparent electrode layer arranged in sequence. The calcium titanate layer includes a plurality of metal oxides, and the metal electrode layer is closest to the outer surface or the inner surface of the lampshade.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the disclosure as claimed.

The following will disclose multiple implementations of the present disclosure with drawings. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. In other words, in some implementations of the present disclosure, these practical details are not necessary. In addition, in order to simplify the drawings, some commonly used structures and components will be depicted in the drawings in a simple schematic manner. In addition, in order to facilitate the reader's viewing, the size of each component in the drawings is not drawn according to the actual scale.

Please refer to Figure 1, which is a schematic diagram of the ecological cycle of a fish tank according to some implementation methods of the present disclosure. Fish tank breeding needs to maintain and imitate the ecological cycle, and the light source L emits red light R, blue light B and green light G. Green aquatic plants can absorb red light R, and red aquatic plants can absorb blue light B. Aquatic plants perform photosynthesis to supply oxygen to organisms, and the carbon dioxide produced by organisms is then provided to aquatic plants. The excretion of organisms is then decomposed by microorganisms to form fertilizer nutrients for aquatic plants, achieving a cycle of symbiosis and prosperity. It takes about 8 to 12 hours for aquatic plants to photosynthesize, and about 60 lumens of light per liter are required. Therefore, the lighting device of the fish tank consumes a lot of electricity when used for a long time. In view of the above, it is necessary to provide a fish tank that saves electricity and energy. A fish tank powered by solar energy is an energy-saving and environmentally friendly solution. Using solar panels to collect solar energy and convert it into electricity to provide lighting for fish tanks can effectively provide sufficient light, create a good growth environment, and reduce the use of city electricity in traditional fish tanks. It is a green choice that is in line with sustainable development.

The present disclosure provides an energy-saving and power-saving fish tank. The lighting device of the fish tank includes a lamp tube and a lampshade. The lampshade includes a double-sided solar panel. The solar panel on the outer side of the lampshade can receive light from the environment (such as sunlight, indoor light source, etc.), and the solar panel on the inner side of the lampshade can recycle the light emitted by the lamp tube. The solar panel converts these two kinds of light into electrical energy for use by the lighting device, thereby achieving the effect of saving electricity and energy.

Please refer to FIG. 2 and FIG. 3 at the same time, which are respectively a circuit block diagram and an external perspective diagram of a fish tank according to some embodiments of the present disclosure. The present disclosure provides a fish tank 100, which includes a water tank 110, a lighting device 120, a first solar panel 130A, a second solar panel 130B, a power distribution control unit 140 and a storage battery 150. The lighting device 120 irradiates light to the water tank 110. The lighting device 120 is located above the water tank 110. In some other embodiments, the position of the lighting device 120 can be adjusted so that a part or all of the lighting device 120 is located inside the water tank 110, or the lighting device 120 is located on the side of the water tank 110. The lighting device 120 includes a lampshade 1201 and a lamp tube 1202, and the lamp tube 1202 is disposed inside the lampshade 1201. The solar panel 130 is disposed on the lampshade 1201. The first solar panel 130A is disposed on the outer surface of the lampshade 1201. The second solar panel 130B is disposed on the inner surface of the lampshade 1201. The power distribution control unit 140 is electrically connected to the first solar panel 130A, the second solar panel 130B and the lighting device 120. The storage battery 150 is electrically connected to the power distribution control unit 140. The power distribution control unit 140 is used to control the switch of the lighting device 120. The storage battery 150 is used to store the electric energy converted by the solar panel 130.

In some embodiments, the fish tank 100 further includes an external power source 160 electrically connected to the power distribution control unit 140. The power distribution control unit 140 can allocate the external power source 160 (mains power) or use the power of the storage battery 150 to power the lighting device 120. In some embodiments, the lamp tube 1202 includes a plurality of three-primary color light-emitting diodes. A plurality of three-primary color light-emitting diodes can provide colorful light and have a power saving effect. In some embodiments, other types of lamp tubes can be used. In some embodiments, the fish tank 100 further includes other components, such as a thermostat, a filter pump, etc., which are powered by the power distribution control unit 140. It should be understood that the position and shape of each component shown in Figure 3 are only schematic and non-restrictive.

It is worth noting that the first solar panel 130A disposed on the outer surface of the lampshade 1201 can receive light from the environment, and the second solar panel 130B disposed on the inner surface of the lampshade 1201 can receive light from the lamp tube 1202. In other words, the second solar panel 130B can recycle the light emitted by the lighting device and convert it into electrical energy again, thereby achieving a recycling effect.

In some embodiments, the lampshade 1201 includes a circular tube type and a rectangular tube type. It should be understood that the shape and size of the lampshade 1201 shown in Figures 4 and 5 are only illustrative and non-restrictive, and lampshades of any other shapes and sizes can be used.

Please refer to FIG. 4, which is a perspective view of a cylindrical lampshade according to some embodiments of the present disclosure. In some embodiments, the first solar panel 130A surrounds the outer surface of the lampshade 1201. In some embodiments, the first solar panel 130A partially covers the outer surface of the lampshade 1201. In other embodiments, the first solar panel 130A completely covers the outer surface of the lampshade 1201. In other words, the first solar panel 130A covers the outer side and top of the lampshade 1201.

Please continue to refer to FIG. 4 . In some embodiments, the second solar panel 130B surrounds the inner surface of the lampshade 1201. In some embodiments, the second solar panel 130B partially covers the inner surface of the lampshade 1201. In other embodiments, the second solar panel 130B completely covers the inner surface of the lampshade 1201. In other words, the second solar panel 130B covers the inner side and top surface of the lampshade 1201.

Please refer to FIG. 5 , which is a perspective view of a rectangular cylindrical lampshade according to some embodiments of the present disclosure. In some embodiments, the first solar panel 130A surrounds the outer surface of the lampshade 1201. In other words, the first solar panel 130A covers four outer sides of the lampshade 1201. In other embodiments, the first solar panel 130A partially covers the outer surface of the lampshade 1201. In other words, the first solar panel 130A covers one or more outer surfaces of the lampshade 1201. In other embodiments, the plurality of first solar panels 130A partially cover one or more surfaces of the outer side of the lampshade 1201, and the plurality of first solar panels 130A are not in direct contact with each other with gaps left between them. In other embodiments, the first solar panels 130A completely cover the outer surface of the lampshade 1201. In other embodiments, the plurality of first solar panels 130A cover the four outer side surfaces and the top surface of the lampshade 1201, and the plurality of first solar panels 130A are in direct contact with each other without gaps left between them.

Please continue to refer to FIG. 5. In some embodiments, the second solar panel 130B surrounds the inner surface of the lampshade 1201. In other words, the second solar panel 130B covers the four inner side surfaces of the lampshade 1201. In other embodiments, the second solar panel 130B partially covers the inner surface of the lampshade 1201. In other words, the second solar panel 130B covers one or more inner surfaces of the lampshade 1201. In other embodiments, multiple second solar panels 130B partially cover one or more inner surfaces of the lampshade 1201, and gaps are left between the multiple second solar panels 130B and they are not in direct contact with each other. In other embodiments, the second solar panel 130B completely covers the inner surface of the lampshade 1201. In other words, the second solar panel 130B covers the four inner side surfaces and the top surface of the lampshade 1201 and the plurality of second solar panels 130B are in direct contact with each other without leaving any gaps. It is worth noting that the rectangular cylindrical lampshade can accommodate a wider area of solar panels 130, so the power generation efficiency is higher.

Please refer to FIG. 6, FIG. 7 and FIG. 8. In some embodiments, the solar panel 130 may include amorphous silicon, microcrystalline silicon, cadmium sulfide, cadmium telluride, copper indium selenide, copper indium gallium selenide, dye-sensitized cells and organic conductive polymers or other suitable transparent thin film solar panels. In some embodiments, the first solar panel 130A and the second solar panel 130B each include a perovskite solar panel. The perovskite solar cell (PSC) has the advantages of high conversion efficiency, flexibility, high stability and low manufacturing cost, and has a higher absorption conversion efficiency for the wavelength of indoor light source or visible light source. The structure of the calcium-titanium solar panel may include a planar structure, an inverted structure or a mesoporous structure, which correspond to the calcium-titanium solar panel structures shown in FIG. 6 , FIG. 7 and FIG. 8 , respectively.

Please refer to FIG. 6 for a planar structural cross-sectional view of a calcium titanate solar panel according to some embodiments of the present disclosure. A solar panel 130 is disposed on a lampshade 1201. A first solar panel 130A is disposed on the outer surface of the lampshade 1201. A second solar panel 130B is disposed on the inner surface of the lampshade 1201. The first solar panel 130A and the second solar panel 130B each include a calcium titanate solar panel of a planar structure, and the calcium titanate solar panel includes a metal electrode layer ME, a hole transport layer HTL, a calcium titanate layer PER, an electron transport layer ETL, and a transparent electrode layer TE arranged in sequence. The metal electrode layer ME is closest to the outer surface or the inner surface of the lampshade 1201. It is worth noting that the planar structured calcium-titanium solar cell has a higher photoelectric conversion efficiency.

The transparent electrode layer TE (transparent electrode) serves as the light incident surface, and a conductive material with high transmittance can be used. The LUMO (Lowest Unoccupied Molecular Orbital) energy level needs to match the electron transport layer ETL. The material of the transparent electrode layer TE may include a transparent conductive film, such as indium tin oxide (ITO), indium zinc oxide (IZO), aluminum-doped zinc oxide (AZO) and fluorine-doped tin dioxide (FTO) or a combination thereof but is not limited thereto. In some embodiments, the transparent electrode layer TE can be formed by spin coating, slot die coating, sputtering, evaporation or other suitable processes.

The electron transmission layer (ETL) is used to promote electron transport and prevent electron-hole recombination. Materials with high electron mobility can be used, and the energy level of the electron transmission layer (ETL) needs to match the PER of the calcium titanate layer. The material of the electron transmission layer (ETL) may include, for example, fullerene, transition metal oxide, or a combination thereof, but is not limited thereto. The transition metal oxide may include, for example, titanium dioxide, zinc oxide, indium oxide, tin dioxide, or a combination thereof, but is not limited thereto. The electron transmission layer (ETL) may be formed by spin coating, slot die coating, sputtering, evaporation, or other suitable processes.

The perovskite layer PER (perovskite layer) is used as a light absorbing layer to absorb light and generate electron-hole pairs. The material of the perovskite layer PER may include an ABX ₃ structure, wherein A is a cation, including, for example, methylammonium, formamidine, cesium or ammonium, B is a cation, including, for example, lead or tin, and X is an anion, including a halogen, such as an iodine ion, a bromine ion, a chlorine ion or a combination thereof. In some embodiments, the material of the calcium titanate layer PER may include, for example, CH ₃ NH ₃ PbI ₃ , CH ₃ NH ₃ PbBr ₃ , CH ₃ NH ₃ PbCl ₃ , CH ₃ NH ₃ PbI ₂ Br, CH ₃ NH ₃ PbI ₂ Cl, CH ₃ NH ₃ PbIBr ₂ , CH ₃ NH ₃ PbICl ₂ , CH ₃ NH ₃ SnI ₃ , and HC(NH ₂ ) ₂ PbI ₃ , or a combination thereof, but is not limited thereto. In some embodiments, the material of the calcium titanate layer PER is methylammonium lead iodide (CH ₃ NH ₃ PbI ₃ , also referred to as MAPbI ₃ ). In some embodiments, the calcite-titanium layer PER can be formed by spin coating, slot die coating or other suitable processes. In some embodiments, spin coating can be used to quickly rotate the substrate to evenly expand the solution in the center of the drop to the outer circle, thereby forming a full-surface calcite-titanium layer PER. In some embodiments, slot die coating can be used to coat the solution in a single direction through a linear nozzle, thereby forming a full-surface calcite-titanium layer PER. It is worth noting that the slot die coating process can form a larger-sized calcite-titanium layer PER.

The hole transport layer (HTL) is used to block the passage of electrons and prevent water and oxygen from invading the calcium titanate layer. The HOMO energy level needs to match the PER of the calcium titanate layer. The material of the hole transport layer (HTL) may include, for example, PEDOT (poly (3,4-ethylene dioxythiophene)), PSS (poly styrene sulfonate) or a combination thereof but is not limited thereto. In some embodiments, the hole transport layer (HTL) may be formed by a spin coating process, a slot die coating process or other suitable processes.

The metal electrode layer ME is used for electron injection. The HOMO energy level needs to match the hole transport layer HTL. The material of the metal electrode layer ME may include a conductive material but is not limited thereto. In some embodiments, the material of the metal electrode layer ME is Ag. In some embodiments, the metal electrode layer ME may be formed by sputtering, evaporation or other suitable processes.

In some embodiments, the first solar panel 130A and the second solar panel 130B may be directly formed on the outer surface and the inner surface of the lampshade 1201. In other words, the metal electrode layer ME is in direct contact with the lampshade 1201. In other embodiments, the first solar panel 130A and the second solar panel 130B may be first formed on a flexible substrate (e.g., PET) and then bonded (e.g., adhered) to the outer surface and the inner surface of the lampshade 1201. In other words, the flexible substrate is located between the metal electrode layer ME and the lampshade 1201, and the metal electrode layer ME is not in direct contact with the lampshade 1201. In some embodiments, the calcium-titanium solar panel further includes a transparent protective layer to protect the transparent electrode layer TE from damage.

Please refer to FIG. 7, which is a cross-sectional view of a trans-structured calcium titanite solar panel according to some embodiments of the present disclosure. A solar panel 230 is disposed on a lampshade 2201. A first solar panel 230A is disposed on the outer surface of the lampshade 2201. A second solar panel 230B is disposed on the inner surface of the lampshade 2201. The first solar panel 230A and the second solar panel 230B each include a calcium titanite solar panel of a trans-structure. The calcium titanite solar panel includes a metal electrode layer ME, an electron transport layer ETL, a calcium titanite layer PER, a hole transport layer HTL, and a transparent electrode layer TE arranged in sequence. The metal electrode layer ME is closest to the outer surface or inner surface of the lampshade 2201. The materials and formation methods of the metal electrode layer ME, the hole transport layer HTL, the calcium titanate layer PER and the transparent electrode layer TE can refer to the materials and formation methods of each layer described in the previous text with respect to FIG. 6. It is worth noting that the calcium titanate solar cell with a trans-structure has better advantages in terms of process temperature and electrical properties.

Please refer to FIG. 8 for a cross-sectional view of a calcium titanate solar panel according to some embodiments of the present disclosure. A solar panel 330 is disposed on a lampshade 3201. A first solar panel 330A is disposed on the outer surface of the lampshade 3201. A second solar panel 330B is disposed on the inner surface of the lampshade 3201. The first solar panel 330A and the second solar panel 330B each include a calcium titanate solar panel with a mesoporous structure. The calcium titanate solar panel includes a metal electrode layer ME, a hole transport layer HTL, a calcium titanate layer PER, a dense layer HBL, and a transparent electrode layer TE arranged in sequence. The calcite layer PER includes a plurality of metal oxides MO. The metal electrode layer ME is closest to the outer surface or the inner surface of the lampshade 3201. The materials and formation methods of the metal electrode layer ME, the hole transport layer HTL, the calcite layer PER and the transparent electrode layer TE can refer to the materials and formation methods of each layer described in the previous text with respect to FIG. 6. In FIG. 8, the dense layer HBL is used as a hole blocking layer to block holes from the calcite layer PER to avoid charge recombination. In some embodiments, the material of the dense layer HBL may include metal oxides, such as titanium dioxide, tin dioxide, zinc oxide or a combination thereof but is not limited thereto. In some embodiments, the dense layer HBL can be formed by spin coating, sputtering, atomic layer deposition, chemical bath deposition or other suitable processes. Metal oxide MO is filled in the calcium titanate layer PER as a bracket to support the calcium titanate layer PER. The material of the metal oxide MO may include titanium dioxide, silicon dioxide, zinc oxide, aluminum oxide, zirconium oxide or a combination thereof but is not limited thereto. It is worth noting that in the mesoporous calcium titanate solar cell, the electron transport layer ETL is in full contact with the calcium titanate layer PER, which can achieve faster electron transmission.

It should be understood that the structures of the calcium-titanium solar panels in the above-mentioned Figures 6, 7 and 8 are all based on the lampshade 1201 at the center as the axis, and the two sides have a multi-layer structure symmetrically arranged. However, Figures 6, 7 and 8 shown in the present disclosure are only schematic and non-restrictive. The first solar panel 130A disposed on the outer side of the lampshade 1201 and the second solar panel 130B disposed on the inner side of the lampshade 1201 can each include calcium-titanium solar panels of the same or different structures. For example, in some embodiments, the first solar panel 130A and the second solar panel 130B of the planar structure shown in Figure 6 are both disposed on the outer side and the inner side of the lampshade 1201. In other embodiments, a first solar panel 130A with a planar structure as shown in FIG. 6 is disposed on the outer side of the lampshade 1201, and a second solar panel 230B with a transverse structure as shown in FIG. 7 is disposed on the inner side of the lampshade 1201. In other embodiments, a first solar panel 130A with a planar structure as shown in FIG. 6 is disposed on the outer side of the lampshade 1201, and a second solar panel 330B with a mesoporous structure as shown in FIG. 8 is disposed on the inner side of the lampshade 1201.

In summary, the present disclosure provides an energy-saving and power-saving fish tank. The fish tank is provided with a solar panel, which collects solar energy and converts it into electrical energy to provide lighting for the fish tank. The lighting device includes a lampshade and a lamp tube. The lampshade includes a double-sided solar panel. The solar panel on the outer side of the lampshade can receive light from the environment, and the solar panel on the inner side of the lampshade can recycle the light emitted by the lamp tube. The solar panel converts these two kinds of light into electrical energy for use in the lighting device, thereby achieving the effect of saving electricity and energy.

Although the present disclosure has been described in considerable detail with reference to various embodiments, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It is obvious to those skilled in the art that various modifications and variations can be made to the structure of the disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, the disclosure is intended to cover modifications and variations of the disclosure that fall within the scope of the appended claims.

L: Light source R: Red light B: Blue light G: Green light 100: Fish tank 110: Water tank 120: Lighting device 1201: Lampshade 1202: Lamp tube 130: Solar panel 130A: First solar panel 130B: Second solar panel 140: Power distribution control unit 150: Storage battery 160: External power supply 2201: Lampshade 230: Solar panel 230A: First solar panel 230B: Second solar panel 3201: Lampshade 330: Solar panel 330A: First solar panel 330B: Second solar panel HTL: Hole transport layer ETL: Electron transport layer TE: Transparent electrode layer ME: Metal electrode layer PER: Calcium-titanium layer HBL: Dense layer MO: Metal oxide

By reading the detailed description of the following embodiments and referring to the attached figures, the present disclosure can be more fully understood. FIG. 1 shows a schematic diagram of the ecological cycle of a fish tank in some embodiments of the present disclosure. FIG. 2 shows a circuit block diagram of a fish tank in some embodiments of the present disclosure. FIG. 3 shows a three-dimensional view of the appearance of a fish tank in some embodiments of the present disclosure. FIG. 4 shows a three-dimensional view of the appearance of a circular tube-shaped lampshade in some embodiments of the present disclosure. FIG. 5 shows a three-dimensional view of the appearance of a rectangular tube-shaped lampshade in some embodiments of the present disclosure. FIG. 6 shows a cross-sectional view of a planar structured calcium-titanium solar panel in some embodiments of the present disclosure. FIG. 7 shows a cross-sectional view of a trans-structured calcium-titanium solar panel in some embodiments of the present disclosure. FIG. 8 shows a cross-sectional view of a mesoporous calcium-titanium solar panel according to some embodiments of the present disclosure.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

100: Fish tank

110: Water tank

120: Lighting device

1201: Lampshade

1202: Tube

130: Solar panels

130A: The first solar panel

130B: Second solar panel

140: Power distribution control unit

150: Storage battery

160: External power supply

Claims (10)

A fish tank, comprising: a water tank; a lighting device, irradiating a light to the water tank, wherein the lighting device comprises a lampshade and a lamp tube, and the lamp tube is arranged inside the lampshade; a first solar panel, arranged on an outer surface of the lampshade; a second solar panel, arranged on an inner surface of the lampshade; a power distribution control unit, electrically connected to the first solar panel, the second solar panel and the lighting device; and a storage battery, electrically connected to the power distribution control unit. The fish tank as described in claim 1 further includes an external power source electrically connected to the power distribution control unit. A fish tank as described in claim 1, wherein the first solar panel surrounds the outer surface of the lampshade. A fish tank as described in claim 1, wherein the second solar panel surrounds the inner surface of the lampshade. A fish tank as described in claim 1, wherein the lampshade includes a circular cylindrical shape and a rectangular cylindrical shape. A fish tank as described in claim 1, wherein the light tube comprises a plurality of three-primary-color light-emitting diodes. A fish tank as described in claim 1, wherein the first solar panel and the second solar panel each include a calcium-titanium solar panel. A fish tank as described in claim 7, wherein the calcium-titanium solar panel includes a metal electrode layer, a hole transport layer, a calcium-titanium layer, an electron transport layer and a transparent electrode layer arranged in sequence, wherein the metal electrode layer is closest to the outer surface or the inner surface of the lampshade. A fish tank as described in claim 7, wherein the calcium-titanium solar panel includes a metal electrode layer, an electron transport layer, a calcium-titanium layer, a hole transport layer and a transparent electrode layer arranged in sequence, wherein the metal electrode layer is closest to the outer surface or the inner surface of the lampshade. A fish tank as described in claim 7, wherein the calcium-titanium solar panel includes a metal electrode layer, a hole transport layer, a calcium-titanium layer, a dense layer and a transparent electrode layer arranged in sequence, wherein the calcium-titanium layer includes a plurality of metal oxides, and the metal electrode layer is closest to the outer surface or the inner surface of the lampshade.

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