OLED Luminous Efficiency Improvement Layer Porphyrazin Derivative
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light emitting diodes (OLEDs) have undesirable characteristics such as high driving voltage, low luminous efficiency, current density, power efficiency, and short lifetime.
Innovation Solution
Incorporation of a luminous efficiency improvement layer comprising porphyrazin, phthalocyanine, or naphthalocyanine derivatives on the electrodes of OLEDs, which enhances light emission efficiency and extends the device's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional OLED structure is used, then device simplicity is maintained, but luminous efficiency is low
Solution Approach 1:
The patent segments the electrode structure by introducing a separate luminous efficiency improvement layer between the electrode and the organic emitting layer. This segmentation allows the electrode to maintain its original function while the added layer specifically addresses luminous efficiency, resolving the contradiction between simplicity and efficiency.
Solution Approach 2:
The luminous efficiency improvement layer acts as an intermediary between the electrode and the organic emitting layer. This intermediary layer modifies the interface properties to enhance light emission efficiency without requiring fundamental changes to the electrode or organic layer materials, thus improving luminous efficiency while maintaining relative structural simplicity.
2Duration of action of stationary object
If conventional OLED structure is used, then manufacturing process is simple, but lifetime is short
Solution Approach 1:
The luminous efficiency improvement layer is deposited beforehand on the electrode surface before assembling the complete OLED structure. This preliminary action prepares the electrode interface in advance to ensure optimal performance and extended lifetime, without complicating the overall manufacturing sequence.
3Power
If conventional OLED structure is used, then driving voltage is high, but power efficiency is low
Solution Approach 1:
The invention changes the optical and electrical parameters at the electrode-organic layer interface by introducing the luminous efficiency improvement layer. This layer modification alters the energy transfer characteristics and reduces non-radiative recombination, thereby improving power efficiency and reducing the effective driving voltage required for operation.
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 use of these derivatives improves luminous efficiency and extends the OLED's operational life by optimizing light emission and reducing power consumption.
Implementation Method 1
Carriers, such as holes and electrons, are re-combined in the emitting layer to form excitons. The excitons are changed from an excited state to a ground state and thus, fluorescent molecules in the emitting layer are excited, thereby emitting light.
Implementation Method 2
The excitons are changed from an excited state to a ground state and thus, fluorescent molecules in the emitting layer are excited, thereby emitting light.
Implementation Method 3
When a voltage is applied between the anode and the cathode, holes injected through the anode move to the emitting layer through the hole transport layer and electrons injected through the cathode move to the emitting layer through the electron transport layer.
Data Source
AI summary
Provided is an organic light emitting diode including: a first electrode; a second electrode; an organic layer between the first electrode and the second electrode; and a luminous efficiency improvement layer disposed on a surface of the first electrode facing away from the organic layer or a surface of the second electrode facing away from the organic layer, wherein the luminous efficiency improvement layer includes a porphyrazin derivative, a phthalocyanine derivative, a naphthalocyanine derivative, or a combination of at least two compounds of the foregoing.