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Design and Development of Highly Efficient Light‐Emitting Layers in OLEDs with Dimesitylboranes: An Updated Review
摘要： With excellent luminescent properties and transport properties, triarylborane compounds containing two mesitylenes (Mes) have gained much attention for their application in OLEDs as light-emitting layers. This study serves as an updated review summarizing recent developments in the design of fluorescent chromophores and phosphorescent host materials for OLEDs comprising small molecular compounds of dimesitylborane (BMes2) as luminescent layers, with attention to the performance of different light-emitting devices. Problems that need to be solved in the research and application of BMes2 in OLEDs are presented and the application prospects of such materials are suggested.
关键词： phosphorescence,OLEDs,fluorescence,dimesitylborane
更新于2025-09-19 17:13:59
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Aggregation-induced phosphorescence enhancement in deep-red and near-infrared emissive iridium( <scp>iii</scp> ) complexes for solution-processable OLEDs
摘要： To fight against the counteractive triplet–triplet annihilation and vibrational deactivation faced by low band-gap phosphorescent emitters, aggregation-induced phosphorescent enhancement (AIPE)-active deep-red and NIR emissive iridium(III) complexes are designed by suitably anchoring electron-withdrawing substituents such as -phenyl (Ir2), -ethyl ester (Ir3), and -trifluoromethyl (Ir4) groups on the N-coordinating quinoline moiety of a (benzo[b]thiophen-2-yl)quinoline cyclometalated ligand along with ancillary picolinate. The fundamentals of the origin of AIPE on Ir2 and Ir4 and its associated excited-state properties are deeply studied through comparison with unsubstituted Ir1 with the help of density functional theory and single-crystal X-ray diffraction analysis. Most importantly, AIPE-active Ir2 is employed for the development of efficient deep-red and NIR PhOLEDs by hybrid solution-processable methods, in which the AIPE effect of Ir2 reaches a maximum external quantum efficiency (EQE) of 7.29% at high doping ratios.
关键词： near-infrared emissive iridium(III) complexes,deep-red,solution-processable OLEDs,Aggregation-induced phosphorescence enhancement
更新于2025-09-19 17:13:59
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Four-membered red iridium( <scp>iii</scp> ) complexes with Ira??Sa??Ca??S structures for efficient organic light-emitting diodes
摘要： Three sulfur atom contained ligands (diphenylcarbamodithioate (dpdtc), di-p-tolylcarbamodithioate (medtc) and bis(4-(trifluoromethyl)phenyl)carbamodithioate (cf3dtc)) were prepared for three red iridium(III) complexes. All (tfmpqz)2Ir(dpdtc), (tfmpqz)2Ir(medtc) and (tfmpqz)2Ir(cf3dtc) complexes were synthesized rapidly at room temperature in 5 min with high yields owing to strong coordination ability between sulfur and iridium atoms, in which 4-(4-(trifluoromethyl)phenyl)quinazoline (tfmpqz) was used as main ligand. Three Ir(III) complexes show distinct PL emissions at the range of 617 - 629 nm with high phosphorescence quantum yields up to of 83%, respectively. With these complexes as dopants, the organic light-emitting devices (OLEDs) with the double-emissive-layer structure of ITO/ HATCN (hexaazatriphenylenehexacabonitrile, 5 nm)/ TAPC ((bis(4-(N,N-ditolylamino)phenyl)cyclohexane, 30 nm)/ Ir(III) complexes: TCTA (4,4',4''-tris(carbazol-9-yl)-triphenylamine) (12 wt%, 10 nm)/ Ir(III) complexes: 26DCzppy (2,6-bis-(3-(carbazol-9-yl)phenyl)pyridine) (12 wt%, 10 nm)/ TmPyPB (1,3,5-tri((3-pyridyl)-phen-3-yl)benzene, 30 nm)/ LiF (1 nm)/ Al (100 nm) achieved good performances. In particular, the device employing (tfmpqz)2Ir(cf3dtc) complex exhibits the champion performances with a maximum luminance of 30 740 cd m-2 and a maximum external quantum efficiency of 26.10%, respectively.
关键词： phosphorescence quantum yields,sulfur atom,iridium(III) complexes,external quantum efficiency,OLEDs
更新于2025-09-19 17:13:59
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A Simple and Rapid Phosphorescence Probe Based on Mn-Doped ZnS Quantum Dots for Chloramphenicol Detection
摘要： An innovative phosphorescence probe based on Mn-doped ZnS quantum dots (Mn:ZnS QDs) was developed for selective detection of chloramphenicol (CAP) via inner-filter effect (IFE). Mn:ZnS QDs were synthesized by water method and modified with L-Cysteine for better stability, and the average diameter of the nanometer particle was 3.8 nm. With the excitation wavelength at 289 nm, the strong phosphorescence of Mn:ZnS QDs can be emitted at 583 nm. The excitation spectrum of Mn:ZnS QDs was substantially overlapped with the absorption spectrum of the target CAP. The excited light of Mn:ZnS QDs can be absorbed partially by CAP when they coexist, the phosphorescence intensity decreased with the increasing concentration of CAP, and it has a good linear relationship. Under optimal conditions, the linear relational concentration range achieved four orders of magnitude from 25 to 1:2 (cid:1) 10 5 ng (cid:3) mL (cid:4)1 (R 2 ? 0:999), with a detection limit (LOD; S=N ? 3) down to 0.81 ng (cid:3) mL (cid:4)1. The simple, rapid and low cost IFE phosphorescent probe exhibited satisfactory recoveries ranging from 88.9% to 98.5% for CAP analysis in spiked honey, which shows a potential for routine screening of CAP in ensuring the food safety.
关键词： inner-filter effect,phosphorescence probe,chloramphenicol,Mn-doped ZnS quantum dots
更新于2025-09-16 10:30:52
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Organic light-emitting diodes with split recombination zones: A concept for versatile color tuning
摘要： White organic light emitting diodes (WOLEDs) for general lighting applications are still mostly considered as a possibility rather than a definitive next step in solid-state lighting technology. Vacuum deposited WOLEDs usually run into troubles of complicated manufacturing processes, incompatible emitters, high-precision requirements for emitting layer structuring and monolithic integration. In this work we present a simple method of achieving white emission from a single-stack OLED with three (red, green and blue) emitters utilizing a laterally structured shadow mask. Only the green emitter is deposited via this mask without any alignment requirements, allowing the decoupling of recombination zones for achieving simultaneous emission from all emitters, circumventing the need of additional charge generating layers or vacuum-breaking structuring steps. A highly tunable white emission is demonstrated, irrespective of charge transporting systems or green emitters used. The resulting WOLEDs show external quantum efficiencies and luminous efficacies up to 14% and 26 lm/W, respectively, with CIE coordinates of (0.40, 0.40) and CRI values of up to 80.
关键词： TADF,WOLED,EQE,phosphorescence,recombination zone,OLED
更新于2025-09-16 10:30:52
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A label-free RTP sensor based on aptamer/quantum dot nanocomposites for cytochrome <i>c</i> detection
摘要： Given the outstanding room-temperature phosphorescence (RTP) of Mn–ZnS quantum dots (QDs) and the specific recognition performance of the aptamer, we built phosphorescent composites from aptamers conjugated with polyethyleneimine quantum dots (PEI-QDs) and applied them to cytochrome c (Cyt c) detection. Specifically, QDs/CBA composites were generated from the electrostatic interaction between the positively-charged PEI-QDs and the negatively-charged Cyt c binding aptamer (CBA). With the presence of Cyt c, the Cyt c can specifically bind with the QDs/CBA composites, and quench the RTP of QDs through photoinduced electron-transfer (PIET). Thereby, an optical biosensor for Cyt c detection was built, which had a detection range of 0.166–9.96 mM and a detection limit of 0.084 mM. This aptamer-mediated phosphorescent sensor with high specificity and operational simplicity can effectively avoid the interference of scattering light from complex substrates. Our findings offer a new clue for building biosensors based on QDs and aptamers.
关键词： aptamer,quantum dots,biosensor,room-temperature phosphorescence,cytochrome c
更新于2025-09-16 10:30:52
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Synthesis and application of a surface ionic imprinting polymer on silica-coated Mn-doped ZnS quantum dots as a chemosensor for the selective quantification of inorganic arsenic in fish
摘要： A novel room temperature phosphorescence chemosensor probe has been successfully developed and applied to the selective detection and quantification of inorganic arsenic (As(III) plus As(V)) in fish samples. The prepared material (IIP@ZnS:Mn QDs) was based on Mn-doped ZnS quantum dots coated with (3-aminopropyl) triethoxysilane and an As(III) ionic imprinted polymer. The novel use of vinyl imidazole as a complexing reagent when synthesizing the ionic imprinted polymer guarantees that both inorganic arsenic species (As(III) and As(V)) can interact with the recognition cavities in the ionic imprinted polymer. After characterization, several studies were performed to enhance the interaction between the targets (As(III) and As(V) ions) and the IIP@ZnS:Mn QDs nanoparticles. The optimization and validation process showed that the composite material offers high selectivity (high imprinting factor) for inorganic arsenic species. The limit of quantification for total inorganic As was 29.6 μg kg?1, value lower than the EU/EC regulation limits proposed for other foodstuffs than fish, such as rice. The proposed method is therefore simple, requires short analysis times and offers good sensitivity, precision (inter-day relative standard deviations lower than 10%), and quantitative analytical recoveries. The method has been successfully applied to assess total inorganic arsenic in several fishery products, showing good agreement with the total inorganic arsenic concentration (As(III) plus As(V)) found after applying other advanced and expensive methods such those based on high-performance liquid chromatography hyphenated to inductively coupled plasma-mass spectrometry.
关键词： Ionic imprinted polymer,Silica-coated Mn-doped ZnS quantum dots,Fish,Room temperature phosphorescence,Chemosensor probe,Inorganic arsenic
更新于2025-09-16 10:30:52
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Novel “turn off-on” sensors for detection of DNA-acrylamide interaction usingZnS quantum dots as a phosphorescent probe
摘要： A novel “turn off-on” sensor for detection of interaction between DNA and acrylamide (ACR) was developed. In this method, L-cysteine capped Mn-doped ZnS quantum dots (QDs) were used as room temperature phosphorescent probes. In the “turn-off” mode, ACR was absorbed onto the surface of QDs via electrostatic interaction, which caused a quenching effect of room-temperature phosphorescence signal by photoinduced electron-transfer mechanism. ACR was removed from the QDs’ surface with the addition of DNA. Thus, the phosphorescence emission of QDs was recovered and the system was turned to the “turn-on” mode. The quenching mechanism of QDs by ACR was collisional (dynamic) and the quenching constant, binding constant, and binding site number were calculated as 3.2 × 10 4 M (cid:0)1 , 2.04 × 10 4 M (cid:0)1 , and 1.2, respectively. An absorption spectrometric method was also used to evaluate ACR-DNA interaction and the binding constant (K) was found as 2.4 × 10 5 M (cid:0)1 . The developed biosensor is simple, is free of interferences coming from autofluorescence and scattering light, and does not need any derivatization step or sample pretreatment.
关键词： quantum dots,DNA interaction,phosphorescence,photoinduced electron transfer,Acrylamide
更新于2025-09-16 10:30:52
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Purely Organic Phosphorescence Emitter-Based Efficient Electroluminescence Devices
摘要： A pure organic molecule 2,6-di(phenothiazinyl)naphthalene (DPTZN) with room temperature phosphorescence (RTP) features was developed. Remarkably, a triazine-benzimidazole based molecule TRZ-BIM can significantly improve the RTP efficiency of DPTZN in DPTZN:TRZ-BIM blend films. The photoluminescence (PL) quantum yield (PLQY) of 10wt% DPTZN:TRZ-BIM blend film is 38%. The RTP property of DPTZN:TRZ-BIM blend films was characterized by steady, time resolved and temperature dependent emission spectra. An organic light emitting diode (OLED) with 10wt% DPTZN:TRZ-BIM blend film as the emitting layer showed a high maximum external quantum efficiency (EQE) of 11.5%, current efficiency (CE) of 33.8 cd A?1 and power efficiency (PE) of 32.6 lm W?1. Herein, we have developed an efficient approach to achieve precious-metal free organic films that can be employed to fabricate high performance phosphorescence OLEDs.
关键词： electroluminescence,OLED,phosphorescent materials,organic phosphorescence,room temperature phosphorescence
更新于2025-09-12 10:27:22
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Self-Healing Amorphous Polymers with Room-Temperature Phosphorescence Enabled by Boron-based Dative Bonds
摘要： Dative bonds are crucial for room-temperature phosphorescence (RTP) of metal complexes, which are nevertheless of high cost and toxicity. Here, we develop a class of amorphous RTP polymers based on non-metal dative bonds, through copolymerizing vinylphenylboronic acid and acrylamide derivates. Non-metal dative bonds, formed between boron and nitrogen/oxygen atoms, can populate triplet excitons through charge transfer and immobilize phosphors to suppress nonradiative relaxation, leading to effective RTP lifetime in air. Moreover, the dynamic nature of the dative bonds enables self-healing and anti-counterfeiting abilities of the RTP polymers. The concept of designing non-metal dative bonds can widely expand the horizon and application of RTP polymers.
关键词： self-healing,polymer,dative bond,room-temperature phosphorescence,boron
更新于2025-09-12 10:27:22