Light-emitting device with improved flexural resistance and electrical connection between layers, production method therefor, and device using light-emitting device
A light-emitting device includes a pair of light-transmissive insulator sheets disposed opposite to each other and two types of light-transmissive electroconductive layers disposed on a common one of or separately on one and the other of the pair of light-transmissive insulator sheets, and at least one light-emitting semiconductor each provided with a cathode and an anode which are individually and electrically connected to the two types of the light-transmissive electroconductive layers. The electrical connection and mechanical bonding between the members are improved by a light-transmissive elastomer which is between the pair of light-transmissive insulator sheets. A method in which a light-emitting semiconductor element and a light-transmissive electroconductive member are subjected to vacuum hot-pressing.
1. A light-emitting device, comprising:
a pair of light-transmissive insulator sheets each provided with a light-transmissive electroconductive layer, or a pair of a light-transmissive insulator sheet provided with light-transmissive electroconductive layers and a light-transmissive insulator sheet which is free from a light-transmissive electroconductive layer, disposed opposite to each other so as to form a region between the pair, and
one or more light-emitting semiconductor element each provided with a cathode and an anode which are individually and electrically connected to respective ones of said light-transmissive electroconductive layers, each anode and each cathode is a single layer structure comprising a surface having a plurality of concavities and a plurality of convexities, and a light-transmissive elastomer, respectively disposed between the pair of light-transmissive insulator sheets so as to fill the region in combination,
wherein the light-transmissive elastomer is at least partially present in the interface between the cathode and anode of the light-emitting semiconductor element and the light-transmissive electroconductive layers,
the light-transmissive elastomer is also filled in a plurality of said concavities of the cathode and anode surfaces, and
a plurality of said convexities of the cathode and anode surfaces directly contact the light-transmissive electroconductive layers.
2. The light-emitting device according to claim 1 , wherein said light-transmissive elastomer covers 10-90% each of the cathode area and the anode area of said light-emitting semiconductor element.
3. The light-emitting device according to claim 1 , wherein said light-transmissive elastomer has a tensile storage elastic modulus of 0.01 Gpa-10 GPa in a temperature range of 0 to 100° C.
4. The light-emitting device according to claim 1 , wherein said light-transmissive elastomer has a glass transition temperature of at most −20° C.
5. The light-emitting device according to claim 1 , wherein each of the cathode and anode of the light-emitting semiconductor element has a surface roughness Ra of 0.1-10 μm.
6. The light-emitting device according to claim 1 , wherein said light-transmissive elastomer comprises an acrylic elastomer.
7. The light-emitting device according to claim 1 , wherein said light-transmissive elastomer is a polymeric elastic material.
8. The light-emitting device according to claim 1 , wherein at least one of the light-transmissive electroconductive layers comprises a conductor film, a transparent resin layer containing a particulate conductor, or a mesh electrode.
9. The light-emitting device according to claim 1 , wherein at least one of the light-transmissive electroconductive layers comprises a sputtered film or vapor-deposited film of a conductor.
10. The light-emitting device according to claim 1 , wherein each of the light-transmissive electroconductive layers comprises a mesh electrode layer.
11. The light-emitting device according to claim 1 , wherein each of the light-transmissive electroconductive layers comprises a plurality of light transmissive electroconductive fillers and a light-transmissive resin binder binding the light transmissive electroconductive fillers in a mutually contacting state.
12. The light-emitting device according to claim 11 , wherein the light transmissive electroconductive fillers occupy 50-95 wt. % of the light-transmissive electroconductive layer.
13. The light-emitting device according to claim 1 , wherein at least one of the light-transmissive electroconductive layers has a sheet resistivity of at most 1000 ohm/□.
14. The light-emitting device according to claim 1 , wherein at least one of the light-transmissive electroconductive layers has a thickness of 0.1-10 μm.
15. The light-emitting device according to claim 1 , which is free from bubbles having a diameter which is equal to or larger than 500 μm within the light-emitting device.
16. An apparatus, comprising a display apparatus or an illumination apparatus including the light-emitting device according to claim 1 .
17. The light-emitting device according to claim 1 , wherein each of the cathode and the anode has a thickness in the range of from 0.1 micrometer to 2 micrometers.