Nanostructured Luminescent Systems via Surface Charge Compensation

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Solution Overview

Problem

Existing photoluminescent and electroluminescent materials face challenges in achieving a strong, extended luminescent effect while being non-toxic and cost-effective, particularly for applications in drug delivery and optoelectronic displays, where the creation of isolated luminescent centers on nanostructured materials is hindered by surface charge imbalances.

Innovation Solution

The method involves modifying the surface of nanostructured materials to create isolated luminescent centers, which are then compensated with polar molecules such as PEG, PEI, or SDS to neutralize the charge imbalance, allowing these centers to exhibit luminescent behavior, and incorporating these materials into systems for biological markers, sensors, and optoelectronic devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the surface of nanostructured material is modified to create isolated luminescent centers, then luminescent effect is enhanced, but surface charge imbalance is generated which inhibits luminescent behavior

Engineering Contradiction:

Improveluminescent effectVSAvoidluminescent behavior

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent converts the harmful surface charge imbalance into a beneficial feature by intentionally creating charged groups (carboxylic acid, hydroxyl, or carbonyl moieties) during surface modification. These charged groups, while initially problematic, are then compensated by polar molecules to actually enhance and stabilize the luminescent centers, transforming the harmful charge imbalance into a useful mechanism for controlling luminescence.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces polar molecules (such as PEG, PEI, or SDS) as intermediary substances that mediate between the charged surface groups and the luminescent centers. These polar molecules compensate for the surface charge imbalance, allowing the luminescent centers to function properly without being inhibited by the charged surface, thus enabling stable luminescent behavior.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If polar molecules are applied to compensate surface charge imbalance, then luminescent behavior is enabled, but additional processing steps are required

Engineering Contradiction:

Improveluminescent behaviorVSAvoidprocessing steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the surface modification step with the charge compensation step into a single integrated process. By selecting polar molecules that also serve as surface modifiers or can be easily applied during standard surface treatment procedures, the patent combines what would otherwise be separate operations into one unified processing step, reducing overall complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs polar molecules that can automatically compensate for surface charge imbalance through their inherent chemical properties without requiring complex external control mechanisms. The polar molecules self-organize on the charged surface through electrostatic interactions, enabling the system to self-regulate the charge balance without additional processing complexity.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables the development of nanostructured luminescent systems that exhibit stable and efficient luminescence, suitable for various applications including drug delivery and optoelectronic displays, by compensating for surface charge imbalances and enhancing the luminescent properties of nanostructured materials.

Implementation Method 1

The application of one or more polar molecules to the charged surface of the nanostructured material results in the compensation or neutralization of the surface charge imbalance.

Methodology Applied

Scientific EffectCharge compensation: Electrostatics

Implementation Method 2

Photoluminescence represents a mechanism by which a material absorbs electromagnetic energy in the UV-Vis-NIR spectral region at one wavelength, followed by the subsequent emission of a portion of this energy at a different, usually longer wavelength.

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 3

electroluminescence relies upon the absorption of electrical energy by a material, followed by the emission of visible light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS8778226B2Luminescent systems based on the isolation of conjugated PI systems and edge charge compensation with polar molecules on a charged nanostructured surface

Publication Date: 2014.07.15 UT BATTELLE LLC

AI summary

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.