Blue organic electroluminescent device and preparation method thereof
A luminescent, blue technology, applied in the field of blue organic electroluminescent devices and their preparation, can solve the problem of reducing the stability of devices, the color purity of pure blue organic electroluminescent devices, luminous efficiency and work stability Performance has not been substantially improved, low power efficiency of the device, etc.
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[0049] The present invention also provides a method for preparing the above-mentioned blue organic electroluminescent device, comprising the following steps:
[0050] forming an anode layer on the substrate;
[0051] A light-emitting layer is formed on the anode layer; the light-emitting layer is formed by a blue organic fluorescent material and a hole-type organic host material; the mass of the blue organic fluorescent material is 8.0% to 8.0% of the mass of the hole-type organic host material 25.0%; the excited state energy of the blue organic fluorescent material is less than the excited state energy of the hole-type organic host material;
[0052] A cathode is formed on the light-emitting layer to obtain a blue organic electroluminescent device.
[0053] According to the present invention, the anode layer is first formed on the substrate; the substrate and the anode layer are the same as those described above, and will not be repeated here. In the present invention, it i...
Embodiment 1
[0065] First, the ITO anode layer on the ITO glass is laser-etched to form a patterned electrode, and then ultrasonically cleaned with cleaning solution and deionized water for 15 minutes and dried in an oven. Then put the dried substrate into the pretreatment vacuum chamber, and then transfer the ITO anode to the metal evaporation chamber after a 10-minute low-pressure oxygen plasma treatment with a voltage of 400 volts in an atmosphere with a vacuum degree of 10 Pa. In 3~5×10 -5 Evaporation of 3nm MoO in a vacuum atmosphere of Pa 3 Anode interface layer 3. Then, the unfinished device was transferred to an organic evaporation chamber at a vacuum of 1-3×10 -5 Under the vacuum atmosphere of Pascal, on the anode interface layer 3, vapor-deposit 40 nanometer thick TAPC hole transport layer / electron blocking layer 4, 10 nanometer thick DBzA doped TcTa light emitting layer 5, 40 nanometer thick TmPyPB hole blocking layer layer / electron transport layer6. Next, the unfinished dev...
Embodiment 2
[0071] First, the ITO anode layer on the ITO glass is laser-etched to form a patterned electrode, and then ultrasonically cleaned with cleaning solution and deionized water for 15 minutes and dried in an oven. Then put the dried substrate into the pretreatment vacuum chamber, and then transfer the ITO anode to the metal evaporation chamber after a 10-minute low-pressure oxygen plasma treatment with a voltage of 400 volts in an atmosphere with a vacuum degree of 10 Pa. In 3~5×10 -5 Evaporation of 3nm MoO in a vacuum atmosphere of Pa 3 Anode interface layer 3. Then, the unfinished device was transferred to an organic evaporation chamber at a vacuum of 1-3×10 -5 Under the vacuum atmosphere of Pascal, on the anode interface layer 3, 40 nanometer thick TAPC hole transport layer / electron blocking layer 4, 10 nanometer thick DBzA doped TcTa light emitting layer 5, 40 nanometer thick Tm3PyP26PyB hole blocking layer were sequentially evaporated. layer / electron transport layer6. Nex...
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