Control Layer Refractive Index Tuning via Electric-Field Nanopacking

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Solution Overview

Problem

The refractive index of film layers formed by nanomaterials through spin coating is fixed and non-adjustable, which affects the performance of devices.

Innovation Solution

A control layer using nano granules that are charged or electrically polarizable in a solvent, with nanoparticles coated by ligands such as carboxyl, amido, thiol, or phosphino groups, allows for adjustable refractive index control by varying the packing density through an applied electric field.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If spin coating is used to form a film layer from nanomaterials, then the film layer can be formed with uniform thickness, but the refractive index of the film layer becomes fixed and non-adjustable

Engineering Contradiction:

Improvefilm layer uniformityVSAvoidrefractive index adjustability

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent applies an external electric field to dynamically control the packing density of nano granules in the film layer. By varying the electric field strength, the refractive index can be continuously adjusted from 1.5 to 2.4, transforming a static property into a dynamically controllable parameter while maintaining film uniformity through controlled granule arrangement

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the physical state and arrangement parameters of nano granules by applying electric fields. The packing density of granules is modified as a controllable parameter, which directly alters the refractive index of the film layer. This allows the same film structure to achieve different optical properties by adjusting the electric field-induced granule packing

Inventive Principle:

Principle #35Parameter changes

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

The control layer can adjust its refractive index between 1.5 and 2.4, enhancing light extraction efficiency and optical quality by controlling the packing density of nano granules.

Implementation Method 1

a material of the control layer includes nano granules that are charged or electrically polarizable in a solvent

Methodology Applied

Scientific EffectElectrical polarization: Polarisation

Implementation Method 2

allows for adjustable refractive index control by varying the packing density through an applied electric field

Methodology Applied

Scientific EffectElectric field effect: Electric Field

Data Source

PatentUS12514111B2Control layer and method for preparing same, and photoelectric device

Publication Date: 2025.12.30 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A control layer and a method for preparing the same, and a photoelectric device are disclosed. A material of the control layer includes nano granules that are charged or electrically polarizable. In the present disclosure, the control layer is formed by the nano granules that are charged or electrically polarizable in a solvent, so that a refractive index of the control layer can be controlled by controlling a density of the nano granules, thereby improving the performance of the device.