Material-Independent Design of Photoluminescent Systems
12-G00206_2034.pdf (683 KB)
The ORNL technique involves (1) providing a nanostructured material; (2) modifying the surface of the material to create isolated regions that will act as luminescent centers, in the process generating a charge imbalance on the surface of the nanostructured material; (3) applying one or more polar molecules to the charged surface of the nanostructured material; and (4) orienting the polar molecules to compensate for or neutralize the surface charge imbalance. Once the surface charge imbalance has been neutralized, the isolated regions can exhibit luminescent behavior.
The nanostructured material itself can be any of a variety of materials, such as boron nitride, amorphous carbon, or silicon carbide, and could be in the form of single-walled nanotubes, multiwalled nanotubes, nanohorns, nano-onions, etc. The formation of the isolated regions and the charge imbalance on the surface of the nanostructured material may be accomplished by acid etching or functionalizing the surface of the nanostructured material with charged groups such as carboxylic acid (−COOH) moieties or hydroxyl (-OH) moieties. The polar molecules may be applied to the charged surface by a number of methods, including immersing the nanostructured material in a liquid solution containing the polar molecules or applying the polar molecules as part of a coating to the surface of the nanomaterial.
- Materials independent
- Flexible processes
- Cost-effective to manufacturea
- Electroluminescent systems for use in light-emitting displays, solar panels, or optoelectronic sensing elements
- Single-electron transistors, diode lasers, and electronic/optical amplifiers
- Inert biological markers/sensors
- High resolution cellular imaging
- Long-term in vivo observation of living organisms at the cellular level
- Tumor detection
- Therapeutic drug delivery, including tumor targeting
- Security ink; signage (e.g., exit signs, safety signs)
- Industrial/factory process monitoring
- Replacement for organic dyes in diagnostic systems (20 × brighter and 100 × more stable than traditional fluorescent reporters)
|Title and Abstract||
Luminescent systems based on the isolation of conjugated PI systems and edge charge compensation with polar molecules on a charged nanostructured surface
A photoluminescent or electroluminescent system and method of making a non-luminescent nanostructured material into such a luminescent system is presented. The method of preparing the luminescent system, generally, comprises the steps of modifying the surface of a nanostructured material to create isolated regions to act as luminescent centers and to create a charge imbalance on the surface; applying more than one polar molecule to the charged surface of the nanostructured material; and orienting the polar molecules to compensate for the charge imbalance on the surface of the nanostructured material. The compensation of the surface charge imbalance by the polar molecules allows the isolated regions to exhibit luminescence.
|Oak Ridge National Laboratory||07/15/2014
|Technology ID||Development Stage||Availability||Published||Last Updated|
|UT-B ID 200802034||Prototype||Available||07/17/2012||07/17/2012|