Researchers at the Organic Photoelectric Research Center (OPERA) of Kyushu University in Japan published a process for producing high-efficiency organic light-emitting elements using Thermal Active Delayed Fluorescence (TADF) in 2012. The team recently published the latest paper in the Academic Journal, showing how to show how The life of the TADF light-emitting element is greatly extended by simple structural correction.
According to the Nanowerk website, the newly developed molecular type of Kyushu University converts electrical energy into light energy, increasing OLED efficiency and effectively reducing the cost of OLED displays and lighting panels. OLEDs are usually composed of layers of organic thin films with different functions. The core is a luminescent organic molecule that combines negatively charged electrons with positively charged holes to release light and heat.
At present, the most common OLED luminescent material molecules are two kinds, one is a fluorescent material with a low price but only 25% of the charge can be used for illuminating, and a phosphorescent material which can generate 100% electric charge using a noble metal such as platinum or ruthenium.
The TADF illuminating components developed by Kyushu University, through ingenious molecular design, can convert all electrical energy into light energy without the use of high-cost precious metals like phosphorescent materials, with efficiency and cost advantages. However, no matter what kind of material is used, the luminous efficiency of OLED will decline after a period of use, which will affect the commercial application of OLED.
Daniel Tsang, the first author of the paper, said that although the original TADF component will only decay by 5% after 85 hours of use, the simple correction of the structure can delay the decay time by a factor of eight.
The researchers used a thin Liq (8-hydroxy-quinolinato lithium) layer with a thickness of 1 to 3 nanometers to sandwich the hole blocking layer, so that the green emitter could be used. 4CzIPN introduces TADF material to prevent holes from leaving the component too early. At the same time, the researchers applied other enhancements published in the literature to mix the electron transport materials in the main emitter layer and add Liq to the electron transport layer to further extend the overall lifetime to 16 times. Researchers have also found that the number of traps used in Liq layer components is much reduced, and these traps are a trap that traps charge and prevents charge from moving freely within the component.
These defects can be observed through the thermally stimulated current program. The charge trapped in the trap can generate electrical excitation that destroys the molecular structure due to the interaction with other charges, resulting in luminescence decay.
The next challenge for TADF will be to improve the shortcomings of phosphorescent materials and to become a stable and efficient blue light luminescent material.
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