Summary of the technology
The most innovative aspect of this innovation is that provides new optospintronic devices with low emission threshold voltages.
Also, the new devices have the following advantages:
Efficiency: light emission threshold voltages from 2 V.
Stability: use of air-stable electrodes, with high work function.
Spin valve properties (magnetoresistance): control of electrical properties by means of magnetic fields, for example light intensity and colour.
Low cost: manufacture with commercial and readily available materials, using soluble deposition methods, much cheaper, and viable on a large scale, that evaporative deposition methods.
Description of the tech for sale
A spin valve is a device, consisting of two or more conducting magnetic materials, whose electrical resistance can change between two values depending on the relative alignment of the magnetisation in the two layers. The resistance change is a result of the Giant Magnetoresistive effect. Currently, there are no commercial electroluminescent devices presenting spin valve behaviour. There have been various attempts that result in devices capable of emitting light only at very high threshold voltage, generally based on conventional OLED structures. The scientific goal for years has been to increase the spintronic polarization of these devices. Researchers from Universitat de València have developed a new opto-spintronic device with low emission threshold voltages (from 2V) in coexistence with magnetoresistance properties. These properties allow the control of the light emitted by means of external magnetic fields.
The new devices have been design using a HyLED configuration (Hybrid Organic-Inorganic Light Emitting Diode) instead of the conventional OLED configuration. This new configuration is based on the use of metal oxides as the electron injection layer, and is inverted with respect to OLEDs, hence making possible to develop simple, air-stable and cheap devices. All these known advantages of HyLEDs versus conventional OLEDs have had a surprising effect when applied to a new field as spintronics. Thus the researchers have achieved for the first time to manufacture a light emitting device controlled by external magnetic fields, with low emission threshold voltages and presenting high stability to air, with a greater interest for technological applications.
Main advantages of its use
- Its HyLED configuration enables the manufacturing of a simpler, cheaper and more air-stable apparatus than those based on OLED, with low emission threshold voltages. The invention is mainly engaging for optoelectronics and optospintronics applications (lighting, displays, etc).
- Opto-spintronic devices have many applications in molecular electronics and molecular spintronics. The ability to control by magnetic fields the light emission and the colour of the emission is especially interesting for optoelectronic applications: lighting, displays, optospintronics, etc.