Electroluminescent device and a light emitting system
地域：
Kowloon
摘要
An electroluminescent device including an electrode, the electrode being ionically conductive; an electroluminescence layer positioned adjacent or in contact with the electrode, the electroluminescence layer being electrically coupled to the electrode; the electroluminescence layer receiving electrical energy from the electrode and illuminating in response to received electrical energy, and wherein the electrode and the electroluminescence layer are repairable such that the function of the electrode and the electroluminescence layer is restored after a deformation.
說明書
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The present disclosure relates to a light emitting device, in particular but not limited a robust electroluminescent device that is adaptable and operable in response to mechanical loading.
Light emitting devices are used in a number of different industries and different applications. LEDs (light emitting diodes) are one example of commonly used light emitting devices. Electroluminescent (EL) devices are another example of commonly used light emitting devices. Electroluminescent (EL) devices have been developed as indispensable elements in sophisticated electronic systems, for example, the emitting light can serve as backlighting source in car control panel. EL devices have been developed and applied to various industries such as bio-inspired soft robotics for visual disguise, artificial skin actuators, flexible and stretchable electronics, wearable electronics, digital displays and flexible sensors.
The primary concern in utilizing EL devices, for example in applications such as flexible and stretchable electronic systems is the stress due to mechanical deformations and the concomitant damages. This can cause failure of the device due to strain exceeding the withstanding limit of the EL device. In addition, maintaining and replacing a dysfunctional component in a multifunctional integrated electronic system is either intractable or costly. There is a need for EL devices that can be adaptable and operable in response to mechanical loading to reduce the need to replace EL devices, such as example in multifunctional integrated electronic systems.
權(quán)利要求
The invention claimed is:1. An electroluminescent device comprising:an electrode, the electrode being ionically conductive an electroluminescence layer positioned adjacent or in contact with the electrode, the electroluminescence layer being electrically coupled to the electrode, the electroluminescence layer receiving electrical energy from the electrode and illuminating in response to received electrical energy, and; wherein the electrode and the electroluminescence layer are repairable such that the function of the electrode and the electroluminescence layer is restored after a deformation; wherein the first electrode and second electrode each comprise an ionically conductive hydrogel and a metal conductor coupled to the ionically conductive hydrogel; wherein the ionically conductive hydrogel comprises an polyacrylic acid and a salt, dissolved into the hydrogel; and wherein the first electrode and second electrode each comprise a layer of electrically conductive metal disposed on the hydrogel to form an electrical double layer on each of the first electrode and second electrode. 2. The electroluminescent device in accordance with claim 1 , wherein the electrode and the electroluminescence layer each are repairable such that the function of the electrode and the electroluminescence layer is restored even after being cut. 3. The electroluminescent device in accordance with claim 1 , wherein the electroluminescence device comprises a first electrode, a second electrode, the electroluminescence layer being sandwiched between the first electrode and the second electrode and the electroluminescence layer arranged in electrical communication with the first electrode and the second electrode. 4. The electroluminescent device in accordance with claim 1 , wherein the electroluminescence layer comprises a polymer and an electroluminescent material. 5. The electroluminescent device in accordance with claim 4 , wherein the electroluminescent material comprises a luminescent centre, a dielectric polymer host-binder, and/or a dielectric enhancement additive. 6. The electroluminescent device in accordance with claim 1 , wherein the first electrode and second electrode are substantially transparent to allow transmittance of light from the electroluminescence layer outwardly. 7. The electroluminescent device in accordance with claim 6 , wherein the first electrode and the second electrode comprise greater than 96% average transmittance in the range of visible light. 8. The electroluminescent device in accordance with claim 1 , wherein the first electrode, second electrode and the electroluminescence layer are self-repairable such that the function of the electrode and the electroluminescence layer is restored after a deformation by reforming hydrogen bonds between two adjacent polymer portions. 9. The electroluminescent device in accordance with claim 1 , wherein the electroluminescence device is self-repairable after the device is cut such that the function, mechanical and physicochemical properties of the electroluminescence device are restored and the structure of the electroluminescence device is restored when the cut portions are positioned adjacent each other or positioned in contact with each other. 10. An electroluminescent device comprising:a multi-layer structure, the multi-layer structure comprising a first electrode, a second electrode and a electroluminescence layer, the electroluminescence layer being sandwiched between the first electrode and the second electrode, the first electrode and second electrode each including a hydrogel and an electrically conductive metal disposed in contact with the hydrogel, the electroluminescence layer comprising a polymer and a metal sulphide, the first electrode and second electrode arranged in electrical communication with the electroluminescence layer, the electroluminescence layer configured to emit light in response to receiving electrical energy, the first electrode and second electrode each are ionically conductive and optically transparent, and at least one electrode and the electroluminescence layer configured to be self-repairable in response to mechanical strain and/or physical separation of electroluminescent device such that mechanical properties and physicochemical properties of the electrode and the electroluminescence layer are restored. 11. The electroluminescent device in accordance with claim 10 , wherein the first electrode and the second electrode each comprise a hydrogel with one or more dissoluble salts. 12. The electroluminescent device in accordance with claim 11 , wherein the first electrode and the second electrode each comprise a polyacrylic acid (PAA) hydrogel and sodium chloride mixed therein. 13. The electroluminescent device in accordance with claim 10 , wherein the electroluminescence layer comprises a polymer, and a nitride component and an electroluminescence material being dispersed onto the polymer, the electroluminescence material being a material that emits light in response to receiving electrical energy. 14. The electroluminescent device in accordance with claim 13 , wherein the polymer comprises a polyurethane matrix, the nitride component comprises hydroxylated boron nitride nanosheets disposed onto or within the polyurethane matrix and the electroluminescence layer comprises zinc sulphide particles disposed onto or within the polyurethane matrix. 15. The electroluminescent device in accordance with claim 13 , wherein the electroluminescence material comprises a phosphor composite. 16. The electroluminescent device in accordance with claim 10 , wherein the first electrode and the second electrode are structured to have 96% average transmittance in the range of visible light. 17. The electroluminescent device in accordance with claim 10 , wherein the electroluminescent device is flexible about at least one axis and self-repairable after being cut into two or more pieces. 18. The electroluminescent device in accordance with claim 11 , wherein the hydrogel comprises a polymer matrix and the polymer matrix comprising at least two crosslink structures, the crosslink structures configured to dissipate energy received from mechanical loads applied to the electroluminescence device. 19. The electroluminescent device in accordance with claim 18 , wherein the crosslink structures comprise an ionic crosslink structure that includes ionic bonds and a covalent crosslink structure that includes covalent bonds or hydrogen bonds. 20. The electroluminescent device in accordance with claim 19 , wherein the covalent and hydrogen bonding crosslink structures are configured to dissipate energy when electroluminescent device is subjected to mechanical loads by rupturing the hydrogen bonds within the crosslinked structure and restore the hydrogen bonds when the electroluminescent device is restored; and the covalent crosslink structure is configured to provide a bridging structure to maintain the physical boundaries of each electrode. 21. The electroluminescent device in accordance with claim 10 , wherein the electroluminescent device is flexible in response to one or more of bending loads, torsion loads, tensile loads and compression loads, the electroluminescent device is flexible such that function of the electroluminescence device is maintained in response to any one or more of the loads.
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