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A display panel and cover layer technology, applied in circuits, electrical components, electrical solid devices, etc., can solve problems such as unsatisfactory light extraction efficiency of devices, ensure overall light extraction efficiency, improve film formation stability and optical performance, and improve transparency. light effect
Active Publication Date: 2017-05-10
WUHAN TIANMA MICRO ELECTRONICS CO LTD +1
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Problems solved by technology
However, when the transmittance of the cathode and the cover layer is low, even with the cover layer, the light extraction efficiency of the device is also not ideal
Method used
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preparation example Construction
[0060] Exemplary as A preparation method comprising the steps of:
[0061]
[0062] When B is selected from any one of substituted or unsubstituted C5-C10 cycloalkyl, substituted or unsubstituted C6-C30 aromatic groups with at least 2 broken bonds, it can be prepared by the following method:
[0063]
Embodiment 1
[0066] figure 1 An OLED display panel S1 is provided, including the following structure from bottom to top:
[0067] Substrate 1, silver reflective electrode (100nm), ITO electrode 2 (15nm), first hole transport layer 3 (10nm), second hole transport layer 4 (110nm), light emitting layer 6 (30nm), first electron transport layer Layer 7 (30nm), second electron transport layer 8 (5nm), magnesium-silver electrode (magnesium-silver mass ratio 9:1wt) 9 (15nm) and covering layer 10, and described covering layer is passed Obtained by evaporation, the thickness of the covering layer is 70nm, and the refractive index n of the covering layer is 450～650nm >1.76, the refractive index of 450nm, 530nm, 620nm is 1.84, 1.78, 1.76 respectively;
[0068] The first hole transport layer is (P-type dopant material) material and Doping, the mixing ratio is 5:95 (mass ratio); the second hole transport layer is Material; light-emitting layer is BD :BH Materials, 5:95; the first electron t...
Embodiment 2
[0070] The difference from Example 1 is that the material of the covering layer is The thickness of the covering layer is 70nm, and the refractive index n of the covering layer 450～650nm >1.8, the refractive indices of 450nm, 530nm, and 620nm are 1.95, 1.87, and 1.82, respectively.
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Abstract
The invention relates to a capping layer arranged on a cathode of an OLED display panel. A material of the capping layer comprises N-contained compound with a structure shown in a formula (I). According to the capping layer, small organic molecules applicable to an evaporation mode are used as the capping layer, and the practical feasibility is achieved. The molecules of the material of the capping layer are symmetrical molecule structures which are beneficial for regular arrangement of the molecules; the film formation stability and optical performance can be improved; moreover, through adoption of triamine derivatives containing carbazoles-benzo conjugated structures, a general absorption area of the material is in an ultraviolet wave band, and an absorption coefficient for visible light is small. The refractive indexes of the material of the capping layer are gradually reduced in a wavelength range of 430-650nm, difference values between high wavebands and low wavebands are small, namely the refractive index change for R / G / B colors is low, the light emergent efficiency influence deviation for the R / G / B is reduced, and the practicability on the panel is achieved.
Description
technical field [0001] The invention belongs to the field of organic electroluminescence materials, and relates to a capping layer, an OLED display panel including the capping layer, and electronic equipment, in particular to a combination of a capping layer material and a cathode material and its application in the field. Applications in Electromechanical Luminescent Devices. Background technique [0002] In top-emitting OLED electroluminescent devices, in order to allow light to emit from the top of the device, a fully reflective anode and a semi-transparent metal cathode are used on both sides of the organic layer. The commonly used cathode metal materials are aluminum, magnesium, silver, ytterbium and other metals or their alloys. When the emitted light passes from the organic layer to the cathode at a certain angle, due to the difference in the refractive index of the film layer, a part of the light will be totally reflected, so that only a part of the light will be us...
Claims
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