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An electrode and an organic electroluminescence device using the same
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An organic light-emitting layer and electrode technology, applied in the field of organic electroluminescent devices, can solve problems such as device instability and shortened service life, and achieve the effects of improving device life, good stability and stable performance
Active Publication Date: 2020-07-24
KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT +1
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[0004] However, single-layer metal cathodes with low work function, such as Al, Mg, Ca, etc., are easily oxidized in the air, resulting in unstable devices and shortened service life. Therefore, alloys are generally selected as cathodes to avoid this problem.
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Embodiment 1
[0029] This embodiment provides an electrode, such as figure 1 As shown, it includes a first conductive layer 1 and a second conductive layer 2 stacked. The first conductive layer 1 is an Ag layer with a thickness of 16 nm; the second conductive layer 2 is a Yb and Mg alloy layer with a volume ratio of Yb and Mg of 1:1 and a thickness of 2 nm.
[0030] This embodiment also provides an organic electroluminescence device, the device structure is:
[0035] The main material layer is a 4,4',4'-tris(carbazol-9-yl)triphenylamine layer;
[0036] The light-emitting layer is Ir(ppy) 3 A doped layer of (three (2-phenylpyridine) iridium (III)) and CBP (...
Embodiment 2
[0043] This embodiment provides an electrode, the structure of which is the same as that of Embodiment 1, the only difference is that the thickness of the second conductive layer is 4 nm.
[0044] This embodiment also provides an organic electroluminescence device, the structure of which is the same as that of Embodiment 1, except that the second electrode is the electrode described in this embodiment.
Embodiment 3
[0046] This embodiment provides an electrode, the structure of which is the same as that of Embodiment 1, except that the thickness of the second conductive layer is 0.5 nm, and the thickness of the first conductive layer is 10 nm.
[0047] This embodiment also provides an organic electroluminescence device, the structure of which is the same as that of Embodiment 1, except that the second electrode is the electrode described in this embodiment.
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Abstract
The present invention relates to the field of organic electroluminescence. The electrode includes a first conductive layer and a second conductive layer stacked, the work function of the first conductive layer is less than 4.7eV, and the second conductive layer is An alloy layer, the work function of at least one metal in the alloy layer is less than 3eV. The composite film layer electrode with work function gradient has excellent stability and can effectively improve device life. The work function of at least one metal in the alloy layer is less than 3eV, which can effectively reduce the organic / metal interface barrier. At the same time, the composite electrode structure with a work function gradient can gradually reduce the electron injection barrier and guide electron injection in an orderly manner. Improve the luminous efficiency of the device.
Description
technical field [0001] The invention relates to the field of organic electroluminescence, in particular to an electrode and an organic electroluminescence device using the same. Background technique [0002] Organic Light-Emitting Diode (English full name is Organic Light-Emitting Diode, referred to as OLED) is an active light-emitting device. Compared with the thin film transistorliquid crystal display (English full name Liquid Crystal Display, LCD for short) and the plasma display panel (English full name Plasma Display Panel, short PDP) in the existing flat panel display technology, the organic light emitting display device using the organic light emitting diode has high contrast ratio, With the advantages of wide viewing angle, low power consumption, and thinner volume, it is expected to become the mainstream flat panel display technology of the next generation, and it is one of the most concerned technologies in flat panel display technology at present. [0003] An OL...
Claims
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