Organic EL device and display
View Patent ↗An organic EL device that increases light emission efficiency by promoting the uniformity of light-emitting layer thickness while reducing the interval between pixel regions, and a display provided with the organic EL device. An organic EL device ( 10 ) has two or more first banks ( 230 ) extending in a line state, a plurality of second banks ( 240 ) that define pixel regions ( 300 ) by dividing a region between the adjacent first banks ( 230 ) and have a height lower than that of the first bank ( 230 ), a hole transport layer ( 250 ) provided independently for each pixel region ( 300 ), and an insulating inorganic film ( 220 ) provided on edges of the pixel region ( 300 ) along side faces of the two first banks ( 230 ) facing each other and defining the pixel regions ( 300 ). With the configuration, even if the interval between the pixel regions is small, a layer in contact with an upper face of the insulating inorganic film ( 220 ) is formed flat by the insulating inorganic film ( 220 ) and a layer thickness of the layer is made uniform.
1. An organic EL device comprising:
two or more first banks extending in a line state;
a plurality of second banks defining pixel regions by dividing a region between adjacent first banks, a height of the second banks being lower than that of the first banks;
a hole transport layer provided independently for each pixel region; and
an insulating inorganic film provided on edges of the pixel region, which edges extend along side faces of the two or more first banks facing each other and defining the pixel regions,
wherein the second banks have a groove connecting the adjacent pixel regions with each other.
2. The organic EL device according to claim 1 , wherein the insulating inorganic film is further provided on edges of the pixel region, which edges extend along side faces of the second banks facing each other and defining the pixel regions.
3. The organic EL device according to claim 1 , wherein:
a material of the hole transport layer includes polyethylenedioxythiophene (PEDOT); and
an upper face of the insulating inorganic film is in contact with a bottom face of the hole transport layer.
4. The organic EL device according to claim 1 , wherein:
a material of the hole transport layer includes tungsten oxide (WO x ), molybdenum oxide (MoO x ), vanadium oxide (VO x ) or a combination of them; and
the organic EL device further comprises an electron blocking layer in contact with an upper face of the insulating inorganic film, and an organic EL material layer set on the electron blocking layer.
5. The organic EL device according to claim 1 , wherein a height of the second banks is 1/10 to 9/10 of a height of the first banks.
6. The organic EL device according to claim 1 , wherein the second banks have a base section with a width larger than that of a distal section, and the width of the base section becomes gradually larger toward a base end.
7. A display provided with the organic EL device according to claim 1 .