Supercooled Liquids with Dynamic Room Temperature Phosphorescence Using Terminal Hydroxyl Engineering

Dynamic room temperature phosphorescence (RTP) materials have potential applications in optoelectronics, which inevitably suffer from poor processability, flexibility or stretchability. Herein, we report a concise strategy to develop supercooled liquids (SCLs) with dynamic RTP behavior using terminal hydroxyl engineering. The terminal hydroxyls effectively hinder the nucleation process of molecules for the formation of stable SCLs after thermal annealing. Impressively, the SCLs show reversible RTP emission via alternant stimulation by UV light and heat. Photoactivated SCLs have phosphorescent efficiency of 8.50 % and a lifetime of 31.54 ms under ambient conditions. Regarding the dynamic RTP behavior and stretchability of SCLs, we demonstrate the applications in erasable data encryption and patterns on flexible substrates. This finding provides a design principle for obtaining SCLs with RTP and expands the potential applications of RTP materials in flexible optoelectronics.     

Tuning the Performance of Room Temperature Phosphorescence Sensing Materials for Oxygen Using Factorial Designs

ABSTRACT

The effects of three experimental factors (pH, precursors, alcohol) on the sensing characteristics of these materials were screened by means of two-level factorial designs. The resulting materials turned out to be useful as luminescent probes for the measurement of dissolved and gaseous oxygen. The photochemical properties and the analytical performance of the RTP sensing phases have been studied by using both gas flow-injection analysis and continuous liquid flow-through systems. The proposed sensing materials were particularly suitable for measuring dissolved oxygen in natural waters. The detection limit attained was 0.004 mg.ml^?1 and a typical precision of ± 1.0% al a 0.6 mg.ml^?1 oxygen level was achieved. Response time for 90% of the final RTP value was less than 90s in a continuous flow mode. No hysteresis effects were noticed.     

Solid Surface Room Temperature Phosphorescence of Polychlorinated Dibenzofurans Enhanced by a Surface Active Agent

Abstract

Room temperature phosphorescence characteristics on filter paper of dibenzofuran (DF) and several polychlorinated dibenzofurans (PCDFs) in the presence of different heavy atoms in conjunction with a surface active agent, sodium lauryl sulfate (NaLS), have been studied. The use of this surfactant produces an enhancement of the phosphorescence intensity in all the cases studied, which improve the sensitivity in the determination of DF and PCDFs. The optimization of experimental conditions like type of filter paper, drying and cooling times of the filter paper after spotting the sample, irradiation time, concentration of heavy atom and concentration of surfactant has been carried out. Phosphorescence lifetimes, linear dynamic range, relative standard deviation and limit of detection of the different compounds were also determined.     

胆酸盐簇集体刚性化微环境的灵敏指示——室温燐光探针法

胆酸盐是一类生物表面活性剂 ,一般含有羟基取代的类固醇骨架 ,并有一带负电的尾链 ,较为常见的胆酸盐有胆酸钠、脱氧胆酸钠、牛磺胆酸钠及牛磺脱氧胆酸钠等 .其分子结构见表 1及图 1所示 .Fig.1　Molecular structure of cholate surfactant胆酸盐是两亲分子 ,具有疏水性凸面和亲水性的凹面 ,在溶液中胆酸盐单体背靠背通过疏水 -亲脂作用力形成一个疏水内芯 ,亲水面朝向溶剂的簇集体 ,并增溶疏水性的小分子于簇集体内芯 ,使之处于一个疏水而高度保护的微环境中 .另外 ,胆酸盐单体之间通过疏水 -亲脂相互作用 ,可形成螺旋形簇集体 .由于具…     

Room Temperature Phosphorescence Optosensor for Terbium

Abstract

A solid surface room temperature phosphorescence optosensing method has been developed for the determination of terbium(III) based on the adsorption of its binary complex with 1,4-bis (l'-phenyl-3′-methyl-5′-pyrazolone-4′-) butanedione-(1,4) (BPMPBD) onto the hydrogen form of a strong cation exchange resin packed in a flow cell in an aqueous flow system. The phosphorescence intensity is a linear function of the concentration of terbium in the range of 8x10^?9 M-6x10^?7 M, and the detection limit is 3x10^?9 M terbium. The response mechanism was also studied. The present optosensor has been used for the determination of trace amounts of terbium in synthetic samples with satisfactory results.     

Ultralow-loss Optical Waveguides through Balancing Deep-Blue TADF and Orange Room Temperature Phosphorescence in Hybrid Antimony Halide Microstructures

Harnessing the potential of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is crucial for developing light-emitting diodes (LEDs), lasers, sensors, and many others. However, effective strategies in this domain are still relatively scarce. This study presents a new approach to achieving highly efficient deep-blue TADF (with a PLQY of 25 %) and low-energy orange RTP (with a PLQY of 90 %) through the fabrication of lead-free hybrid halides. This new class of monomeric and dimeric 0D antimony halides can be facilely synthesized using a bottom-up solution process, requiring only a few seconds to minutes, which offer exceptional stability and nontoxicity. By leveraging the highly adaptable molecular arrangement and crystal packing modes, the hybrid antimony halides demonstrate the ability to self-assemble into regular 1D microrod and 2D microplate morphologies. This self-assembly is facilitated by multiple non-covalent interactions between the inorganic cores and organic shells. Notably, these microstructures exhibit outstanding polarized luminescence and function as low-dimensional optical waveguides with remarkably low optical-loss coefficients. Therefore, this work not only presents a pioneering demonstration of deep-blue TADF in hybrid antimony halides, but also introduces 1D and 2D micro/nanostructures that hold promising potential for applications in white LEDs and low-dimensional photonic systems.     

Acquiring Charge-Transfer-Featured Single-Molecule Ultralong Organic Room Temperature Phosphorescence via Through-Space Electronic Coupling

Although long-lived triplet charge-transfer (³CT) state with high energy level has gained significant attention, the development of organic small molecules capable of achieving such states remains a major challenge. Herein, by using the through-space electronic coupling effect, we have developed a compound, namely NIC-DMAC, which has a long-lived ³CT state at the single-molecule level with a lifetime of 210 ms and a high energy level of up to 2.50 eV. Through a combination of experimental and computational approaches, we have elucidated the photophysical processes of NIC-DMAC, which involve sequential transitions from the first singlet excited state (S₁) that shows a ¹CT character to the first triplet excited state (T₁) that exhibits a local excited state feature (³LE), and then to the second triplet excited state (T₂) that shows a ³CT character (i.e., S₁ (¹CT)→T₁ (³LE)→T₂ (³CT)). The long lifetime and high energy level of its ³CT state have enabled NIC-DMAC as an initiator for photocuring in double patterning applications.     

Use of an Imaging Spectrograph System with a Fiber Optical Sensor and Two Dimensional Cooled Ccd Detector For Solid Surface Room Temperature Phosphorescence of Pesticides

ABSTRACT

This paper presents a development of a fiber optic sensor for solid surface room temperature phosphorescence of pesticides. The system is based on an imaging spectrograph coupled with a cooled two-dimensional charge coupled device detector. An optimization approach using a different mode of reading out data, the effects of moisture in solid matrix phosphorescence and the effects of heavy atoms are discussed. Spectral characterizations on Whatman N⁰1 filter papers of Warfarin, Naptalam, and naphthalene-type pesticides were evaluated. Limits of detection at ng to pg levels were estimated for all compounds. Satisfactory reproducibility of measurements was observed. The standard addition method was used to determine concentrations of Warfarin and Naptalam pesticides present together in a mixture. Results obtained show the potential of the device for the quantitative analysis of environmental pollutants.     

Achieving White-Light Emission Using Organic Persistent Room Temperature Phosphorescence

Artificial lighting currently consumes approximately one-fifth of global electricity production. Organic emitters with white persistent RTP have potential for applications in energy-efficient lighting technologies, due to their ability to harvest both singlet and triplet excitons. Compared to heavy metal phosphorescent materials, they have significant advantages in cost, processability, and reduced toxicity. Phosphorescence efficiency can be improved by introducing heteroatoms, heavy atoms, or by incorporating luminophores within a rigid matrix. White-light emission can be achieved by tuning the ratio of fluorescence to phosphorescence intensity or by pure phosphorescence with a broad emission spectrum. This review summarizes recent advances in the design of purely organic RTP materials with white-light emission, describing single-component and host-guest systems. White phosphorescent carbon dots and representative applications of white-light RTP materials are also introduced.     

12种嘌呤类化合物的滤纸基质室温燐光法研究

较为详细地研究了１２种嘌呤类化合物以滤纸为基质的室温燐光（ＲＴＰ）光谱特性与分子结构的关系，以及重原子效应和酸度效应对ＲＴＰ的影响。     

6-磺酰氯香豆素的室温燐光特性

通过多种重原子微扰剂和实验条件的选择,成功地实现了C6SCl在数种基质上的RTP发射。发现Pb(Ⅱ)盐是这种RTP发射的最有效的外部重原子微扰剂。在滤纸基质上,以1mol/L Pb(Ac)_2作重原子微扰剂获得了强度高且信/背比亦高的RTP信号,λ_(ex)/λ_(em)=320/496nm。0.2μl点样体积中,C6SCl含量在4～200pmol范围内与RTP信号强度呈良好的线性关系。     

Room-Temperature Multiple Phosphorescence from Functionalized Corannulenes: Temperature Sensing and Afterglow Organic Light-Emitting Diode**

Corannulene-derived materials have been extensively explored in energy storage and solar cells, however, are rarely documented as emitters in light-emitting sensors and organic light-emitting diodes (OLEDs), due to low exciton utilization. Here, we report a family of multi-donor and acceptor (multi-D-A) motifs, TCzPhCor, TDMACPhCor, and TPXZPhCor, using corannulene as the acceptor and carbazole (Cz), 9,10-dihydro-9,10-dimethylacridine (DMAC), and phenoxazine (PXZ) as the donor, respectively. By decorating corannulene with different donors, multiple phosphorescence is realized. Theoretical and photophysical investigations reveal that TCzPhCor shows room-temperature phosphorescence (RTP) from the lowest-lying T₁; however, for TDMACPhCor, dual RTP originating from a higher-lying T₁ (T₁^H) and a lower-lying T₁ (T₁^L) can be observed, while for TPXZPhCor, T₁^H-dominated RTP occurs resulting from a stabilized high-energy T₁ geometry. Benefiting from the high-temperature sensitivity of TPXZPhCor, high color-resolution temperature sensing is achieved. Besides, due to degenerate S₁ and T₁^H states of TPXZPhCor, the first corannulene-based solution-processed afterglow OLEDs is investigated. The afterglow OLED with TPXZPhCor shows a maximum external quantum efficiency (EQE_max) and a luminance (L_max) of 3.3 % and 5167 cd m⁻², respectively, which is one of the most efficient afterglow RTP OLEDs reported to date.     

Study on the Interaction of Mitomycin C with ct-DNA by Pd-Porphin Room Temperature Phosphorescence Probe

Study of the interaction of drugs with calf thymus DNA (ct-DNA) in molecular level1-4 is helpful to understand the fundamental aspects of activation of anticancer drugs and provide the valuable information for designing and developing new antitumor agents. Mitomycin C (MMC) is an anticancer drugs being widely used in clinic with high activity and effectiveness for many cancers. DNA has been proved to be the main target molecule of MMC in the body. The activated MMC can hinder the rep…     

含咔唑高分子水溶液的室温磷光

含咔唑高分子水溶液的室温磷光博日吉汗·格日勒图，印杰（内蒙古师范大学化学系，呼和浩持，０１００２２）（上海交通大学应用化学系）关键词磷光，铊离子，Ｎ－乙烯基咔唑－丙烯酸共聚物芳香族化合物吸收辐射后可在室温发射荧光，但芳香族化合物小分子只有在低温（７７...     

茶叶中咖啡因的纸基质室温燐光法体内药代动力学研究

以快速定量滤纸为基质 ,用KI NaAc为重原子微扰剂建立了测定痕量咖啡因的滤纸基质室温光(PS RTP)分析法。并用于茶叶中咖啡因的测定及其在人体内的药代动力学研究。实验表明 :PS RTP法用于茶叶中咖啡因的测定准确、灵敏。受试者饮茶后 1～ 2h尿样中咖啡因排泄达高峰 ,2 4h后基本排泄完毕。咖啡因的尿排泄量占总摄取量的 64 .2 5 %。     

Recent Advances of Pure Organic Room Temperature Phosphorescence Materials for Bioimaging Applications

Bioimaging,as a powerful and helpful tool,which allows people to investigate deeply within living organisms,has contributed a lot for both clinical theranostics and scientific research.Pure organic room temperature phosphorescence(RTP)materials with the unique features of ultralong luminescence lifetime and large Stokes shift,can efficiently avoid biological autofluorescence and scattered light through a time-resolved imaging modality,and thus are attracting increasing attention.This review classifies pure organic RTP materials into three categories,including small molecule RTP materials,polymer RTP materials and supramolecular RTP materials,and summarizes the recent advances of pure organic RTP materials for bioimaging applications.     

Macroscopic Assembly of Chiral Hydrogen-bonded Metal-free Supramolecular Glasses for Enhanced Color-tunable Ultralong Room Temperature Phosphorescence

Glassy materials, with desirable mechanical rigidity, shaping ability, high transparency, are attracting great interest in diverse fields. However, optically bulk molecule-based glasses are still rare, mainly due to limited monomeric species and harsh preparation conditions. Herein, we report a facile bottom-up solution fabrication process to obtain metal-free supramolecular glasses (SMGs) at the macroscopic scale using L-Histidine and hexamethylenetetramine as building blocks. The chiral SMGs possess color-tunable ultralong room temperature phosphorescence (decay lifetime up to 141.2 ms) and circular polarized luminescence (g factor up to 8.7×10⁻³). The strong hydrogen bonds effectively drive the formation of SMGs, and provide a rigid microenvironment to boost triplet exciton generation. By virtue of excitation- and temperature-dependent ultralong phosphorescence of the SMGs, applications including multicolored displays, visual UV detection, and persistently luminescent thermometer are demonstrated.     

The Analysis of Theophylline — Containing Pharmaceuticals by Room Temperature Phosphorescence

Abstract

A simple and specific technique is used in analyzing pharmaceutical preparations (capsules, elixirs, syrups, and tablets) for theophylline and related compounds. The procedure consists of dissolving (diluting) appropriate amounts of the preparations and standards in (with) a 1 M KI-water solution, spotting 5 μL of each resultant solution onto filter paper discs, determining the phosphorescence intensities at room temperature and comparing sample signal levels to those of standards. The quantities of active ingredients and standards used in the determinations ranged from 25 ng to 1 μg. The results indicate that room temperature phosphorescence is useful for analyzing pharmaceutical preparations where active ingredients are usually contained in a wide variety of matrices.     

Room Temperature Phosphorescence pH Switch Based on Photo-induced Electron Transfer

In this paper, photoinduced electron transfer(PET)phosphoroionophore,N-(1-bromo-2-naphthylmethyl)-dicthanolamine (BND)was synthesized and its phosphorescent characteristics were studied,The experimental results showed that strong phosphorescence could be observed in β-cyclodextrin apueous solution only at low pH value ,This system combined AND and NOT function to produce a three-input inhibit (INH)logic gate .     

基于Mn掺杂ZnS量子点室温磷光法检测盐酸巴马汀

本文以3-巯基丙酸(3-Mercaptopropionic Acid,MPA)为稳定剂,采用水相合成法制备了Mn掺杂ZnS量子点(Mn∶ZnS QDs),基于Mn∶ZnS QDs的室温磷光性质,盐酸巴马汀(Palmatine Hydrochloride,PaH)可与Mn∶ZnS QDs发生静电作用,使得Mn∶ZnS QDs发生室温磷光猝灭效应,从而发展了一种高效、快速检测人体体液中痕量PaH的新方法。实验结果表明,当PaH的浓度在0.75~30μmol/L范围时,其浓度与室温磷光猝灭强度(ΔIRTP)呈良好的线性关系,相关系数为0.996,检出限为0.35μmol/L,加标回收率为94.0%~103.3%。