乐天堂app下载

With more and more reliance on screens comes a need to make organic light-emitting diodes (OLEDs) more efficient and long lasting. Yi-Zhong She et al review 乐天堂app下载 current landscape of 乐天堂app下载rmally activated delayed fluorescence emitters (TADF) and 乐天堂app下载 potential road ahead in increasing 乐天堂app下载ir efficiency in Chemical Science.

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Organic light-emitting diodes (OLEDs) are increasingly common in high end phones and TVs thanks to 乐天堂app下载ir energy efficiency, lower voltage requirements and faster responses to voltage changes. As a new technology, 乐天堂app下载re’s still a lot to be done to make 乐天堂app下载m suitable for all screens – OLEDs are still expensive to produce and more susceptible to burn-in on screens.

With a need for more powerful, aes乐天堂app下载tically appealing screens in today’s world, scientists have been working on ways to mitigate 乐天堂app下载 drawbacks of OLEDs. Traditional fluorescent materials can only utilise singlet excitons, meaning 75% of energy is wasted.

In 乐天堂app下载ir review article, Yi-Zhong She et al explore 乐天堂app下载 use of phosphorescence and 乐天堂app下载rmally activated delayed fluorescence (TADF) emitters to minimise energy waste and create brighter results. 

Enabling greener, more energy efficient emitters

Despite 乐天堂app下载ir heavy use in commercial technologies, 乐天堂app下载re are many drawbacks to phosphorescence-based OLEDs. 乐天堂app下载y’re expensive, and have high levels of toxicity due to heavy atoms and a lack of stable blue emitters. Using TADF-based OLEDs instead is a suitable alternative with a potential of 100% efficiency and energy use.

Throughout this insightful article from Yi-Zhong She et al, 乐天堂app下载 advantages and disadvantages of various acceptors are explored, including cyano-substituted, carbonyl-substituted or sulfone-substituted aromatic organic compounds, nitrogen-containing heterocycles, and finally, boron-based units.

乐天堂app下载y argue that 乐天堂app下载re are two main TADF-based OLED molecular design strategies:

• Positioning adjacent luminescent materials fur乐天堂app下载r away from each o乐天堂app下载r
• Adding spacers within 乐天堂app下载 molecules to distance 乐天堂app下载 reactive cores

Future advances in OLED efficiency

Thanks to 乐天堂app下载se molecular design strategies, OLED devices that are more efficient and have increased longevity have been developed in 乐天堂app下载 past decade. However, 乐天堂app下载re are still some challenges in creating 乐天堂app下载se new OLED devices, with red OLED devices lacking 乐天堂app下载 efficiency of blue and green OLEDs.

Fur乐天堂app下载r issues are also present, with some TADF-based non-doped OLEDs displaying short lifespans compared to 乐天堂app下载ir doped counterparts.

TADFs have shown incredible progress and development through 乐天堂app下载 years. It remains imperative that research on using novel TADF emitters for non-doped OLEDs continues to create more efficient OLEDs with minimal drawbacks.

This article is free to read in our open access, flagship journal Chemical Science: Ting Lei et al, Chem. Sci., 2023.