TWI643524B - Asymmetric structure electroluminescent element with photothermal separation technology - Google Patents

Abstract

An asymmetric structure electroluminescent device having a photothermal separation technique, wherein an electroluminescent layer has a first side and a second side is opposite to the first side; a dielectric layer is disposed on the electroluminescent layer a first side; an air glue layer is disposed on the second side of the electroluminescent layer; a first transparent conductive substrate is coupled to the dielectric layer and connected to a power source; and a second transparent conductive substrate is coupled to the air glue layer and connected The power supply. After the light and heat generated by the electroluminescent layer reach the air gel layer, the light can be diffused by the air glue layer, and the heat is blocked by the air glue layer, thereby causing heat from the dielectric layer and the first transparent layer. The conductive substrate conducts the output, and a thermoelectric conversion module is combined with the first transparent conductive substrate to perform thermoelectric conversion to provide regenerative power.

Description

Asymmetric structure electroluminescent element with photothermal separation technology

The present invention relates to the technical field of an electroluminescent device, and more particularly to an asymmetric structure electroluminescent device having a photothermal separation technique.

The phenomenon of electroluminescence was first discovered in 1936, but it was not until 1951 that the discovery of transparent electrodes indirectly promoted the design of electroluminescent elements as planar light sources. Currently, electroluminescent elements have been used in lighting devices and displays.

Taiwan Patent No. I388239 discloses an electroluminescent device and a method for fabricating the same, wherein the electroluminescent device is provided with a dielectric layer on opposite sides of a phosphor layer, and one side is disposed on each side of each dielectric layer. electrode. Since the material layers and the stacking order on the two sides of the phosphor layer are the same, the prior patent form a symmetrical structure of the electroluminescent element. Although the patent application can provide an electroluminescence effect, the waste heat generated by the electroluminescence element is not properly processed and applied.

Taiwan Patent No. I596982 discloses a transparent inorganic thin film electroluminescent display element and a method for manufacturing the same, wherein the film structure is an insulator layer (dielectric layer) disposed on opposite sides of a light-emitting layer, and each A conductive layer is disposed on one side of the insulator layer. The structure of the thin film electroluminescent display element disclosed in the prior patent is a symmetrical structure, and the prior patent does not teach the proper treatment and application of the waste heat generated by the electroluminescent element.

The invention provides an asymmetric structure electroluminescent device with photothermal separation technology, which can solve the problem of overheating of the electroluminescent device without affecting the illumination or display performance.

It is an object of the present invention to provide an asymmetric structure electroluminescent device having a photothermal separation technique, which is capable of separating light generated by an electroluminescent device from heat and performing thermoelectric conversion to further convert waste heat energy into regenerative electric power.

In order to achieve the above object and effect, the electroluminescent device of the present invention comprises an electroluminescent layer having a first side and a second side opposite the first side; a dielectric layer disposed on the electroluminescent light The first side of the layer; an air glue layer disposed on the second side of the electroluminescent layer; a first transparent conductive substrate coupled to the dielectric layer and connected to a power source; and a second transparent conductive substrate coupled to the air gel Layer and connect the power supply.

Since the opposite sides of the electroluminescent layer are the dielectric layer and the air glue layer respectively, an asymmetric structure is formed, and after the light and heat generated by the electroluminescent layer reach the air glue layer, the light can be The air glue layer is oozing out, and the heat is blocked by the air glue layer, so that heat is conducted and conducted by the dielectric layer.

a thermoelectric conversion module is coupled to the first transparent conductive substrate, so that thermal energy conducted by the dielectric layer is conducted to the thermoelectric conversion module via the first transparent conductive substrate, and then thermoelectric conversion can be performed to apply the electrical excitation light. The effect of waste heat generated by components.

10‧‧‧Electrical excitation layer

12‧‧‧ first side

14‧‧‧ second side

20‧‧‧Dielectric layer

30‧‧‧Air glue layer

40‧‧‧First transparent conductive substrate

50‧‧‧Second transparent conductive substrate

60‧‧‧Power supply

70‧‧‧Thermal conversion module

72‧‧‧Thermal chip

74‧‧‧heat absorbing film

76‧‧‧ Heat sink

Fig. 1 is a schematic view showing the structure of the present invention.

Figure 2 is a schematic view showing the structure of the power supply and the illuminating and heating states of the present invention.

FIG. 3 is a schematic structural view of a thermoelectric conversion module according to the present invention.

Figure 4 is a graph showing the relationship between the temperature and time of the hot and cold end of the thermoelectric chip of the present invention.

Figure 5 is a graph showing the output voltage and current versus time of a thermoelectric chip of the present invention.

Figure 6 is a graph showing the relationship between illumination and time of the present invention.

Referring to FIG. 1 , an electroluminescent device includes an electroluminescent layer 10 , a dielectric layer 20 , an air bonding layer 30 , a first transparent conductive substrate 40 , and a second transparent conductive substrate . A combination of 50.

Further, the electroluminescent layer 10 has a first side 12 and a second side 14, and the first side 12 and the second side 14 are tied on opposite sides. The dielectric layer 20 is disposed on the first side 12 of the electroluminescent layer 10. The air glue layer 30 is disposed on the second side 14 of the electroluminescent layer 10. The first transparent conductive substrate 40 is bonded to the dielectric layer 20 , and the second transparent conductive substrate 50 is bonded to the air adhesive layer 30 .

The electroluminescent layer 10 described above comprises and mixes a predetermined proportion of phosphor powder, terpineol, ethyl cellulose and polyethylene glycol. The dielectric layer 20 contains and mixes a predetermined ratio of barium titanate (BaTiO ₃ ) powder and a resin. The air gel layer 30 contains and mixes a predetermined ratio of air gel powder, terpineol, ethyl cellulose, and polyethylene glycol. The first transparent conductive substrate 40 and the second transparent conductive substrate 50 are indium tin oxide (ITO) substrates, which have electrical conductivity.

In the fabrication of the present embodiment, each material is applied between the first transparent conductive substrate 40 and the second transparent conductive substrate 50 in the order of different layers, and is baked and dried by a heating platform. Since the opposite sides of the electroluminescent layer 10 are respectively different materials and properties of the dielectric layer 20 and the air bonding layer 30, the structure of the embodiment is defined as an asymmetric structure.

Referring to FIG. 2 , in this embodiment, a power source 60 is connected to the first transparent conductive substrate 40 and the second transparent conductive substrate 50 . When the power source 60 is activated, the illuminating center in the electroluminescent layer 10 is excited by the electron incident of the high electric field, and the electrons in the ground state of the low-orbit domain first jump to the excited state of the high-orbital domain; The excited state of the orbital domain jumps back to the ground state of the low-orbit domain, and the energy released by the process is expressed in the form of light and heat.

After the light and heat generated by the electro-optic layer 10 reaches the air-adhesive layer 30, the light can be diffused from the air-adhesive layer 30, and the heat is blocked by the air-adhesive layer 30, thereby turning the heat to the dielectric layer 20. Conducted output. In this embodiment, an electroluminescent element having photothermal separation can be formed.

Referring to FIG. 3, in a further use state of the embodiment, a thermoelectric conversion module 70 can be disposed on one side of the first transparent conductive substrate 40. After the electroluminescent layer 10 emits light and generates heat, the thermoelectric conversion module 70 receives heat outputted from the dielectric layer 20 for thermoelectric conversion.

Further, the thermoelectric conversion module 70 includes a heat absorbing sheet 74 and a heat sink 76 disposed on opposite sides of a thermoelectric wafer 72. The heat sink sheet 74 may be a graphite sheet, and the heat sink sheet 76 may be a graphite sheet, and one side of the contact air surface is sprayed with a boron nitride paint, and the heat sink sheet 74 is used to bond the first transparent conductive substrate 40.

Referring to FIG. 4, after the thermoelectric conversion module 70 is configured in this embodiment, the temperature difference between the hot end temperature (the heat absorbing sheet) and the cold end temperature (the heat sink) of the thermoelectric chip is displayed under the action of an alternating voltage of 120 volts. Up to 45 ° C or more. Referring to FIG. 5, the maximum output voltage and the highest output current of the present embodiment can be measured above 120 volts and the maximum output current can be 1.4 volts or more and about 170 milliamperes, respectively. Referring again to Fig. 6, the luminance of the electroluminescent device of the present embodiment can be up to about 1.9 lumens per square meter. Therefore, the implementation of this embodiment can retain a sufficient amount of Brightness and the ability to provide proper thermoelectric conversion.

Therefore, in this embodiment, the photothermal separation technology is combined with the electroluminescence element to form an asymmetric structure, and the appropriate thermoelectric conversion means can solve the problem of overheating of the conventional electroluminescence element, and at the same time, the available thermoelectric conversion regeneration can be utilized. electric power.

The above embodiments are merely illustrative of the technology of the present invention and its effects, and are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the technical spirit and spirit of the present invention. Therefore, the scope of protection of the present invention should be as listed in the patent application scope mentioned later. .

Claims (4)

An asymmetric structure electroluminescent device with photothermal separation technology is used for connecting a power source and generating a luminescence phenomenon, comprising: an electroluminescent layer having a first side and a second side opposite to the first a dielectric layer disposed on the first side of the electroluminescent layer; an air gel layer disposed on the second side of the electroluminescent layer; a first transparent conductive substrate coupled to the a dielectric layer is connected to the power source; a second transparent conductive substrate is coupled to the air glue layer and connected to the power source; a thermoelectric conversion module, the thermoelectric conversion module is combined with the first transparent conductive substrate and receives the dielectric The layer conducts the heat of the output for thermoelectric conversion; wherein the thermoelectric conversion module comprises a heat absorbing sheet and a heat sink disposed on opposite sides of the thermoelectric wafer, the heat absorbing sheet is combined with the first transparent conductive substrate; wherein the electricity is The opposite sides of the excitation layer respectively form an asymmetric structure between the dielectric layer and the air glue layer. After the light and heat generated by the electro-expansion layer reach the air glue layer, the light can be transparently formed by the air glue layer. Heat is Air barrier adhesive layer, thereby enabling the heat generated by the dielectric layer of conductive output. The asymmetric structure electroluminescent device with photothermal separation technology according to claim 1, wherein the heat absorption sheet is a graphite sheet, and the heat sink is a graphite sheet, and one side of the contact air surface is sprayed with boron nitride. coating. An asymmetric structure electroluminescent device having photothermal separation technology according to claim 1, wherein the electroluminescent layer is a mixture of phosphor powder, terpineol, ethyl cellulose and polyethylene glycol. An asymmetric structure electroluminescent element with photothermal separation technology as described in claim 1 And the air gel layer is a mixture of air gel powder, terpineol, ethyl cellulose and polyethylene glycol.