Optical coupler and preparation method for same

Abstract

The invention discloses an optical coupler. The optical coupler comprises a substrate, and a luminous thin film group, a transparent electric insulating and isolating layer and a photosensitive thin film group, which are sequentially stacked on the substrate, wherein the photosensitive thin film group further comprises a first electrode of the photosensitive thin film group, a photosensitive functional layer and a second electrode of the photosensitive thin film group; the photosensitive functional layer comprises an organic photosensitive layer with photoelectric conduction effects or photosensitivity; and the absorption spectrum width of the photosensitive layer is more than or equal to 300nm; the color coordinates of the luminous thin film group are CIEx=0.05 to 0.7 and CIEy=0.05 to 0.7. According to the optical coupler, by the photosensitive layer with a great absorption spectrum width, the range of the color coordinates of the luminous thin film group can be widened, limitations to the selection of light sources are reduced, the transmittance of a medium is ensured, and meanwhile, the luminous intensity is also effectively enhanced, so that the effective absorption of the photosensitive thin film group over light rays emitted by the luminous thin film group is ensured, and the current transmission ratio is increased.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to an optocoupler device with high current transmission ratio and a preparation method thereof. Background technique [0002] An optocoupler is an optoelectronic device that is usually used to transmit signals while being electrically isolated. It can convert a signal into an optical signal, and then convert the optical signal into another signal that can be detected. It generally includes at least three important functional components: a functional component that can convert electrical signals into light and output light, and has An electrically insulating insulating layer that is electrically insulating and capable of transmitting light, and a photosensitive functional component that takes an optical signal as input and outputs a detectable signal. The most commonly used optocoupler devices, such as figure 1 As shown, use a light-emitting device A to convert an electrical signal i...

AI Technical Summary

Problems solved by technology

The different absorption values ​​at different wavelengths of the absorption spectrum will still lead to changes in the photosensitivity effect when the wavelength of the light source drifts, thus affecting the transmission of signals

Therefore, organic semiconductor materials with broad absorption spectra cannot solve the above problems well.

At the same time, organic semiconductor materials in the prior art have a large gap compared with inorganic semiconductor materials in terms of mobility and charge transport. Therefore, it is generally believed that the current transfer ratio of optocoupler devices using organic materials is lower than that of inorganic semiconductor materials. Inorganic optocouplers are much smaller

In view of the above understanding, at present, there is no precedent for the use of organic photosensitive materials with broad absorption spectrum in optocouplers

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