Electrically addressable passive device, method for electrical addressing of same and use of said device and method
A device and addressing technology, applied in the direction of logic circuits using optoelectronic devices, logic circuits using specific components, logic circuits using diode rectifiers, etc., can solve problems such as inability to prove bistable switching memory cells
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example 1
[0068] Example 1: Writing with Joule heat
[0069] A strong current flowing through a logic unit applied at the x, y intersection point between the electrical conductors m, n will heat the functional medium based on the organic conductive material. With judicious choice of materials, the impedance of the bulk material can be changed reversibly or irreversibly by a current pulse, and the changed impedance can be measured and read out on the conductors m, n forming the electrode set E of the logic unit.
[0070] If the device according to the present invention is made as a data storage device with high storage density, the logic cells are very close together, avoiding crosstalk caused by impedance changes in adjacent cells due to thermal diffusion forms when writing operations are performed is important. Short write pulses are therefore mandatory, since the typical spatial resolution achievable is represented by the thermal diffusion length. The latter is a clear quantity that...
example 2
[0074] Example 2: Writing with the aid of light generation
[0075] Light exposure is known to slow down or speed up chemical changes in organic materials.
[0076] In one embodiment of the device according to the invention, the organic bulk consists wholly or partly of light-emitting organic compounds which can be activated by the application of an electric current. Such organic light-emitting diodes (OLEDs) are currently in the commercial development stage. The degradation mechanism of OLEDs is the subject of extensive research, an important consequence being the shielding of the diode body material against UV or blue radiation, which is fundamental when considering long lifetimes.
[0077] In the present invention, the sensitivity of ultraviolet and blue light to produce intense and controllable localized radiation by exciting ultraviolet and / or blue light-emitting OLEDs is exploited. As noted below, the typical radiative effects that accompany Joule heating of OLEDs can ...
example 3
[0079] Example 3: Writing with Internal Optical Generation, Reading with Direct Impedance Measurement
[0080] In this case, the only function of the light is to trigger and / or accelerate the chemical changes of the functional medium 1 in the unit 2 . A simple general structure is shown in Image 6 , in which a polymer emitting ultraviolet and / or blue light is placed between the anode 3 and cathode 4 of the electrode set, and a rectifying junction is formed at one interface. The forward bias induces a current, emission of light and interaction of the light with the organic material of cell 2 . Instantaneous heating is generated, the relationship between the added electrical energy turned into heat consumption and used to generate light depends on the functional medium and electrical excitation conditions, and the combined effect of heat and light causes chemical changes in the unit due to one or several suitable mechanisms. One is chain breakage in the conjugated molecule, w...
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