Heat Blocking Film With Charge Extraction to Prevent Heat Re-Emission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional heat blocking devices with infrared-absorbing particles face inefficiencies as they re-emit absorbed energy as heat, failing to effectively restrict infrared radiation incidence on sensitive areas.

Innovation Solution

Incorporating a heat blocking film with infrared-absorbing particles that generate electrons and holes, paired with an acceptor to receive these charge carriers, allowing their controlled release outside the device, thereby inhibiting thermal energy recombination and emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If infrared-absorbing particles are used to block heat, then infrared ray absorption is improved, but absorbed energy is re-emitted as heat to the indoor side

Engineering Contradiction:

Improveinfrared ray absorptionVSAvoidheat re-emission

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent introduces an acceptor material as an intermediary between the infrared-absorbing particle and the indoor environment. This acceptor receives charge carriers (electrons or holes) from the particle, preventing the recombination that would otherwise generate heat. The acceptor acts as a mediator that converts the energy pathway from thermal re-emission to charge carrier extraction, thereby solving the contradiction between effective infrared absorption and heat re-emission prevention.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the thermal radiation mechanism (heat re-emission) with an electrical mechanism (charge carrier generation and extraction). Instead of allowing the absorbed infrared energy to be converted back to thermal energy and re-emitted, the system substitutes this with a photoelectric-like process where charge carriers are generated and extracted, converting thermal energy management into an electrical energy extraction problem.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If conventional heat blocking compositions are used, then infrared ray absorption is achieved, but wavelength selectivity and visible light transmittance are limited

Engineering Contradiction:

Improveinfrared ray blockingVSAvoidvisible light transmittance

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent applies local quality by designing a system where different components have specialized functions: the infrared-absorbing particle is optimized for infrared absorption, while the acceptor material is optimized for charge carrier extraction. This localized functional optimization allows the system to achieve superior infrared blocking without necessarily compromising visible light transmittance, as each component operates in its optimal performance regime.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs composite materials by combining infrared-absorbing particles with acceptor materials in a heat blocking composition. This composite structure enables the system to simultaneously achieve infrared absorption and charge carrier extraction functionalities, creating a material system that outperforms conventional single-material heat blocking solutions in both infrared blocking and visible light transmittance characteristics.

Inventive Principle:

Principle #40Composite materials

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 effectively blocks infrared radiation by preventing the re-emission of absorbed energy as heat, reducing temperature rises and enhancing the device's ability to manage thermal loads.

Implementation Method 1

a particle that absorbs the infrared ray and generates an electron and a hole

Methodology Applied

Scientific EffectPhotoexcitation: Photoelectric Effect

Implementation Method 2

an acceptor that receives the electron or the hole from the particle

Methodology Applied

Scientific EffectCharge transfer: Redox Reactions

Implementation Method 3

blocks at least a part of an infrared ray with which the heat blocking film is irradiated

Methodology Applied

Scientific EffectThermal radiation blocking: Absorption (EM radiation)

Data Source

PatentUS20230361235A1Heat blocking device, heat blocking film, and heat blocking composition

Publication Date: 2023.11.09 KYOTO UNIV

AI summary

The present disclosure is a heat blocking device 101 that includes a heat blocking film 10 including: a particle that absorbs an infrared ray and generates an electron and a hole; and an acceptor that receives the electron or the hole from the particle. A charge carrier selected from the electron and the hole is released from the heat blocking film 10 to an outside of the device. The heat blocking device 101 can function as a “heat removing” device. The heat blocking film 10 may be a single-layer film or a multilayer film.