Detection of Oxygen Based on Host-Guest Doped Room-Temperature Phosphorescence Material

Quantitative oxygen detection,especially at low concentrations,holds significant importance in the realms of biology,complex environments,and chemical process engineering.Due to the high sensitivity and rapid response of the triplet excitons of phosphorescence to oxygen,pure organic room-temperature phosphorescence(RTP)materials have garnered widespread attention in recent years for oxygen detection.However,simultaneously achieving ultralong phosphorescence at room temperature and quantitative oxygen detection from pure organic host-guest doped materials poses challenges.The d ensely packed materials may decrease non-radiative decay to increase the phosphorescence,but are unsuitable for oxygen diffusion in oxygen detection.Herein,the oxygen sensitivity of host-guest doped RTP materials using 4-bromo-N,N-bis(4-(tertbutyl)phenyl)aniline(TPABuBr)as the host and 6-bromo-2-butyl-1H-benzo[de]isoquinoline-1,3(2H)-dione(NIBr)as the guest was developed.The doped material exhibits fluorescence-phosphorescence dual-emission behavior at room temperature.The tert-butyl groups in TPABuBr facilitate appropriate intermolecular spacing in the crystal state,enhancing oxygen permeability.Therefore,oxygen penetration can quench the phosphorescence emission.The observed linear relationship between the phosphorescence intensity of the doped material and the oxygen volume fraction conforms to the Stern-Volmer equation,suggesting its potential for quantitative analysis of oxygen concentration.The calculated limit of detection is 0.015%(φ),enabling the analysis of oxygen with a volume fraction of less than 2.5%(φ).Moreover,the doped materials demonstrate rapid response and excellent photostability,indicating their potential utility as oxygen sensors.This study elucidates the design and characteristics of NIBr/TPABuBr doped materials,highlighting their potential application in oxygen concentration detection and offering insights for the design of oxygen sensors.

Room-temperature phosphorescence from purely organic materials

Room-temperature phosphorescence（RTP） materials have attracted great attention due to their involvement of excited triplet states and comparatively long decay lifetimes.In this short review,recent progress on enhancement of RTP from purely organic materials is summarized.According to the mechanism of phosphorescence emission,two principles are discussed to construct efficient RTP materials：one is promoting intersystem crossing（ISC） efficiency by using aromatic carbonyl,heavyatom,or/and heterocycle/heteroatom containing compounds;the other is suppressing intramolecular motion and intermolecular collision which can quench excited triplet states,including embedding phosphors into polymers and packing them tightly in crystals.With aforementioned strategies,RTP from purely organic materials was achieved both in fluid and rigid media.

Recent Advances in Organic Room-Temperature Phosphorescence of Heteroatom(B/S/P)-Containing Chromophores

Purely organic room-temperature phosphors,which have received extensive attention as emerging stateof-the-art luminescent materials in various fields,have a longer lifetime than fluorophores.The energy gap law and El-Sayed’s rule provide clear design principles for the development of organic room-temperature phosphorescence.Therefore,the incorporation of heteroatoms(such as sulfur and phosphorus)usually promotes the intersystem crossing rate and increases the 3(π,π*)configuration to realize long lifetimes.Furthermore,boron-containing phosphors not only display excellent phosphorescence properties but also expand El-Sayed’s rule without(n,π*)transitions.This review summarizes recent work on organic phosphorescence of heterocycles with boron,sulfur,and phosphorus heteroatoms and highlights the significance of the guidelines for constructing efficient phosphorescence molecules.This work is instrumental in further diversifying the pool of phosphorescent molecules and developing new and effective design strategies.

纯有机电致室温磷光材料与器件研究进展

纯有机室温磷光(RTP)材料由于能够直接利用电致激发产生的75%的三线态激子,近年来在有机电致发光领域受到研究人员的广泛关注。然而,由于纯有机材料理论上的自旋禁阻特性,使得三线态激子的辐射速率慢、激子寿命长,从而难以与非辐射耗散竞争。因此,通过有效的分子设计策略实现增强的自旋-轨道耦合,从而促进快速的系间窜越和磷光辐射过程,进而实现高磷光量子效率并抑制长三线态激子寿命导致的各种非辐射失活,对于开发高效的纯有机电致RTP材料与器件至关重要。本文从RTP的分子结构设计出发对近年来的纯有机电致室温磷光材料和器件进行综述,总结了含有不同重原子的纯有机磷光材料的电致发光性能,指出目前研究中需要解决的关键问题,并对其在电致发光领域的应用前景进行了展望。

Smart phosphorescence from solid to water through progressive assembly strategy based on dual phosphorescent sources

Developing smart room-temperature phosphorescence(RTP)materials with facile and efficient strategies have attracted increasing attention.Herein,tunable RTP materials with two phosphorescent sources and stepwise enhanced phosphorescence in water are obtained through an in-situ self-assembly strategy based on the sensitization of phosphors by trimesic acid(TMA)through simple doping and the rigidification of phosphors by hydrogen-bonded organic frameworks(HOFs).As expected,doped TMA+phosphors simultaneously promote the RTP emission of phosphors and maintain TMA phosphorescence.In-situ assembled HOF(MATMA)@phosphors facilitate smart RTP emission in water due to the coexistence of phosphorescent HOF(MA-TMA)host and phosphors guest.Additionally,such RTP materials with good processability demonstrate the application potential in information security,benefitting from their varied afterglow lifetimes and easy luminous recognition in the darkness.This work will inspire the design of dual phosphorescent source RTP systems and provide new strategies for the development of smart RTP materials in water.

纯有机室温磷光材料研究现状与策略

纯有机室温磷光材料因其成本低廉和性能易调控等优点,成为目前功能材料领域研究的热点。本文详细介绍了近年来纯有机室温磷光材料的发展,系统归纳了纯有机小分子晶体、聚合物和智能响应的室温磷光材料进展,并总结了在室温大气环境下实现有机室温磷光的有效策略。