相关实验视频

Updated: May 21, 2025

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

嵌入B/N中心的螺旋单元用于构建高效的多重共振TADF发射器

Lin Wu^1,2, Chunyu Liu^1,2,3, Denghui Liu^3,4

¹Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.

Angewandte Chemie (International ed. in English)

|March 21, 2025

概括

研究人员开发了新的多重共振热激活延迟光 (MR-TADF) 发射器,通过将螺旋化单元纳入核心. 这些发射器实现了高效率和狭窄的排放,用于先进的有机发光二极管 (OLED).

科学领域:

材料科学材料科学材料科学
有机电子有机电子
光物理学的光学物理学

背景情况:

对于有机发光二极管 (OLED) 的传统分子设计,通常会在外围使用螺旋单元.
开发具有狭窄排放光谱的高效和稳定的发射器对于先进的显示技术至关重要.

研究的目的:

设计和合成新的多重共振热激活延迟光 (MR-TADF) 发射器.
研究将9,9'-螺旋 (SF) 单元纳入/多重共振 (B/N-MR) 发射器核心的影响.
为了评估这些发射器在OLED设备中的性能.

主要方法:

四个新型MR-TADF发射器 (SF-BN1至SF-BN4) 的合成,其中包括集成的SF单元.
光物理性质的表征,包括光发光量子产量 (PLQYs) 和半最大全宽度 (FWHM).
使用合成发射器制造和测试OLED设备,分析外部量子效率 (EQE) 和电光 (EL) 特性.

主要成果:

新型发射器在溶液中表现出狭窄的FWHM (15-21nm) 和高的PLQY (高达90%) 在膜中.
基于SF-BN1的OLED实现了高EQE (29.0%),蓝色排放接近BT.2020标准.
基于SF-BN3的OLED显示出高的EQE (29.8%),而超光OLED达到35.5%的EQE.
发射器结构和设备参数的微妙变化显著影响光学和EL特性.

结论:

将SF单元完全或部分纳入B/N-MR核心是开发高性能MR-TADF发射器的可行策略.
开发的发射器显示出在OLED应用中实现高效和光谱纯净的发射的巨大潜力.
了解结构-属性关系是优化发射器和设备性能的关键.

关键词:

在半极最大的全宽度.多重共振是什么意思多重共振是什么意思有机发光二极管是有机发光二极管.螺旋多环芳香碳化合物螺旋多环芳香碳化合物热激活的延迟光效应

更多相关视频

Fluorescence Imaging with One-nanometer Accuracy FIONA

Fluorescence Imaging with One-nanometer Accuracy FIONA

Published on: September 26, 2014

Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping

Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping

Published on: August 26, 2010

相关概念视频

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

Spin–Spin Coupling Constant: Overview

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...

¹³C NMR: ¹H–¹³C Decoupling

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Tandem Mass Spectrometry

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called collision-induced...