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Making an emissive layer for multicolored OLEDs
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A technology of emissive layer and emissive material, which is applied in coatings, devices for coating liquid on the surface, semiconductor devices, etc., can solve problems such as increased working voltage and influence on working stability, and achieve the effect of simplifying the manufacturing process
Inactive Publication Date: 2012-05-23
GLOBAL OLED TECH
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However, the presence of the barrier layer inevitably leads to a significant increase in the operating voltage of the subpixels in two of the three colors
The presence of barriers may also have a negative effect on job stability
Method used
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Embodiment 1
[0083] Devices were constructed using conventional vacuum evaporation in the following sequence:
[0084] 1) A glass substrate coated with an 85 nm indium tin oxide (ITO) layer as an anode was sequentially ultrasonicated in a commercially available cleaner, cleaned in deionized water, exposed to oxygen plasma for about 1 minute, and passed through such as US CHF as described in 6,208,075 3 coated with 1nm fluorocarbon (CF x) a hole injection layer (HIL);
[0085] 2) Deposit a 60nm thick NPB layer on the ITO anode as a hole transport layer (HTL);
[0086] 3) Form a 30 nm thick non-emitting layer (NEL) with 93% NPB and 7% GD-1 on the HTL;
[0087] 4) Form a 15nm thick NPB buffer layer on the NEL;
[0088] 5) Form a 20nm thick blue light emitting layer (BLEL) with 99.2% host-1 and 0.8% BD-4 on HTL2;
[0089] 6) The first electron transport layer (ETL1) of host-1 is subsequently formed on the BLEL with a thickness of 32.5 nm;
[0090] 7) Form a second electron transport laye...
Embodiment 2
[0095] Another device was constructed in a similar manner to Example 1 as follows:
[0096] 1) Make a glass substrate coated with an 85nm indium tin oxide (ITO) layer as an anode sequentially ultrasonically treated in a commercially available cleaner, cleaned in deionized water, exposed to oxygen plasma for about 1 minute, and passed through such as the United States CHF as described in Patent No. 6,208,075 3 coated with 1nm fluorocarbon (CF x ) a hole injection layer (HIL);
[0097] 2) Form a 35 nm thick first non-emissive layer (NEL1) on the HIL with 98.3% NPB and 1.7% RD-1;
[0098] 3) Form a 15nm thick NPB buffer layer (BL1) on NEL1;
[0099] 4) Form a 30 nm thick second non-emissive layer (NEL2) on the buffer with 93% TAPC and 7% GD-1;
[0100] 5) Form a 5nm thick TAPC buffer layer (BL2) on NEL2;
[0101] 6) Form a 20 nm thick blue light emitting layer (BLEL) with 99.2% host-1 and 0.8% BD-4 on BL2;
[0102] 8) The first electron transport layer (ETL1) of host-1 is s...
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Abstract
A method of making an electroluminescent device having a substrate, and at least one blue light emitting layer and at least one non-emissive layer containing an emissive material that emits light longer in wavelength than blue light, these two layers being directly separated by and in direct contact with a non-emissive buffer layer; and heating the electroluminescent device after fabrication to cause the long wavelength emissive material to diffuse from the non-emissive layer into at least the buffer layer such that the long wavelength emissive material comes into contact with the blue light-emitting layer such that the recombination energy in the emitting layer is preferentially transferred to the diffused emissive material compared to the blue emissive material and the light emitted is longer in wavelength than blue light.
Description
technical field [0001] The present invention relates to methods of fabricating multicolor organic light emitting devices (OLEDs), and more particularly to methods of providing, in RGB pixelated OLED devices, an emissive layer whose emissive characteristics can be controlled by making a second emissive The material changes by diffusing from a non-emitting layer to being in contact with the emitting layer. Background technique [0002] Organic light-emitting devices, also known as organic electroluminescence (EL) devices or organic interior junction light-emitting devices, comprise spaced electrodes separated by an organic light-emitting structure (also called an organic EL medium) that responds to the electrode Light is emitted by applying a potential difference between them. At least one of the electrodes is light-transmissive, and the organic light-emitting structure may have multiple layers of organic thin films that respectively provide hole injection and transport from ...
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