OLED Light Emitting Layer Doped with Electron Transport Material
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Solution Overview
Problem
Current OLED color display technologies face challenges in achieving high energy efficiency and low power consumption, particularly in the white light+RGB color filters technology, where the light emitting layer lacks electron transport material, leading to lower energy efficiency and higher power consumption.
Innovation Solution
The OLED color display device incorporates a light emitting layer comprising a first blue light emitting layer and a second red, green, or yellow light emitting layer, both doped with luminescent and electron transport materials, along with a color conversion layer that includes blue, green, and red light filter units to synthesize white or blue, green light, enhancing energy efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If white light+RGB color filters technology is used, then manufacturing process is simplified and manufacture cost is reduced, but energy efficiency is lower and power consumption is higher
Solution Approach 1:
The patent changes the chemical composition parameters of the light emitting layer by doping it with electron transport materials (such as Alq3, BCP, or TPBi) at specific concentrations (0.1-10 wt%). This parameter modification enables the light emitting layer to efficiently transport electrons while maintaining its luminescence properties, thereby improving energy efficiency without requiring changes to the overall device structure or manufacturing process
Solution Approach 2:
The patent creates a composite light emitting layer by combining luminescent materials (host materials) with electron transport materials (guest materials). This composite structure allows the layer to simultaneously perform both luminescence and electron transport functions, resolving the contradiction between manufacturing simplicity and energy efficiency
2Device complexity
If light emitting layer is not doped with electron transport material, then manufacturing process is simpler, but light emitting position is too close to the interface causing lower energy efficiency
Solution Approach 1:
The patent modifies the compositional parameters of the light emitting layer by introducing electron transport materials at optimized concentrations (0.1-10 wt%). This parameter change shifts the light emitting position away from the interface with the electron transport layer, reducing exciton annihilation and improving energy efficiency while maintaining manufacturing simplicity
Solution Approach 2:
The electron transport material acts as an intermediary substance within the light emitting layer, facilitating electron transport and stabilizing the light emitting position. This intermediary component prevents direct interaction between electrons and the electron transport layer interface, reducing energy loss through exciton annihilation
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 configuration promotes luminescence efficiency and reduces power consumption by utilizing electron transport materials in the light emitting layers and a color conversion layer to prevent exciton annihilation and achieve color display with higher energy efficiency.
Implementation Method 1
Organic Light Emitting Diode (OLED) is a flat panel display technology... self-illumination... light emitting layer (Emitter) located on the Hole Transport Layer
Implementation Method 2
a color conversion layer formed at an inner side of the package cover plate... the white light or the blue, green light is filtered by the blue light filter unit to be blue light, and is filtered by the green light filter unit to be green light, and is converted by the red light conversion unit to be red light
Data Source
AI summary
The present invention provides an OLED color display device, comprising a substrate (1), an anode (11), a thin film transistor array (21), a Hole Injection Layer (22), a Hole Transport Layer (23), a light emitting layer (3), an Electron Transport Layer (24), a cathode (12), a package cover plate (2), a color conversion layer (4) and a seal frame (5); the light emitting layer (3) comprises a first light emitting layer (31) and the second light emitting layer (32), and both the first light emitting layer (31) and the second light emitting layer (32) are manufactured by host material doped with guest material, and the guest material comprises luminescent material and electron transport material; the first light emitting layer (31) is a blue light emitting layer, and the second light emitting layer (32) is a red, green lights commonly emitting layer, a yellow light emitting layer or a green light emitting layer; lights emitted by the first light emitting layer (31) and the second light emitting layer (32) synthesize white light or blue, green light possessing higher energy efficiency and luminescence efficiency. The power consumption is low.