Electroluminescent device made of organic material
An electroluminescent, organic layer technology, applied in the field of multilayer electroluminescent devices, to achieve the effects of easy adjustment, reduced efficiency and service life
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Embodiment 1
[0065] Embodiment 1: Device 1
[0066] Use a device with the following structure:
[0067] ITO / / compound 1 (layer thickness 38 nm) / / compound 2 (layer thickness 45 nm) / / Sm.
[0068]
[0069] Compound 1 Compound 2
[0070] The compounds were synthesized as described in EP-A-0 676 461 .
[0071] Devices were prepared as follows: Compound 1 was spin-coated at 2000 rpm onto pre-cleaned ITO (on glass) from a 10 mg / ml solution in chlorobenzene. Compound 2 and the cathode were coated by vacuum sublimation. The current-voltage curve is shown on figure 2 middle. Key potential energy values were determined by electrochemical measurements: compound 1 (IP1 = 5.0 eV; EA1 < 2.0 eV), compound 2 (IP2 = 5.9 eV; EA2 = 2.5 eV). The photoluminescence maxima of the two compounds are 3.1eV (Compound 1) and 3.3eV (Compound 2), respectively. In contrast, the electroluminescence maximum of the devices prepared in this way was clearly shifted to longer wavelengths: 2.5 eV.
Embodiment 2
[0073] Use a device with the following structure:
[0074] ITO / / compound 1 (layer thickness 38nm) / / compound 3 (layer thickness 39nm) / / Mg-Al alloy (3 / 97).
[0075]
[0076] Compound 1 Compound 3
[0077] Compound 3 was synthesized as described in A. Mannschreck et al., J. Chem. Res (9), 1995,180.
[0078] Devices were prepared as follows: Compound 1 was coated onto pre-washed ITO by spin coating at 2000 rpm from a 10 mg / ml solution in chlorobenzene. Compound 3 and the cathode were coated by vacuum sublimation. The current-voltage curve is shown on image 3 middle. Key potential energy values were determined by electrochemical measurements: Compound 1 (IP1 = 5.0 eV; EA1 6.0 eV; EA2 = 3.3 eV). The photoluminescence maxima of the two compounds are 3.1 eV (compound 1) and 3.0 eV (compound 2). In contrast, the electroluminescence maximum of the device prepared in this way was clearly shifted to longer wavelengths: 1.8 eV.
Embodiment 3
[0080] The device in Example 1 is provided with a UV / VIS absorbing film that completely absorbs light with a wavelength of less than 450 nm (transmittance < 0.01%).
[0081] This device is stored in daylight. Functional testing after seven days showed little change to the device, as it had when it was first fabricated. In contrast, the efficiency of the control device without protection from light dropped significantly after 7 days.
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