Novel ultrabright luminescent copper nanoclusters and application in light-emitting devices.
TL;DR: In this article, two newly synthesized ultra-small copper nanoclusters, [Cu3(μ3-H)(μ2-dppy)4]-ClO4)2 (1) and [Cu4(μ4-H))(μ 2-dped)4(m2-Cl)2](ClO 4) (2) (dppy = diphenyl-2-pyridylphosphine), have been shown to exhibit ultrabright yellow and yellow-green room-temperature phosphorescence (RTP) emission,
About: This article is published in Chemical Communications.The article was published on 2021-09-28. It has received 7 citations till now. The article focuses on the topics: Phosphor & Phosphorescence.
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TL;DR: In this article , a new and elaborate strategy was proposed to prepare photoluminescent Cu NCs by using Cu-based metal-organic frameworks (Cu-MOFs) as the precursor.
Abstract: Copper nanoclusters (Cu NCs) have emerged as promising platform for biosensing, but it remains a challenge to fabricate highly stable Cu NCs with controllable photoluminescence. Herein, we propose a new and elaborate strategy to prepare photoluminescent Cu NCs by using Cu-based metal-organic frameworks (Cu-MOFs) as the precursor. The generated Cu NCs display ordered nanowire structure and superior stability due to the crystal structure of Cu-MOFs. Moreover, the Cu NCs possess unique pH-dependent photoluminescence property. With pH increasing, the yellow-green emission of Cu NCs at 520 nm decreases, and new cyan emission at 455 nm appears and increases gradually. This process might be related to the structure change of the Cu NCs from aggregated nanowire into dispersed spherical particle. On the basis, a facile ratiometric fluorescent sensing platform for pH is fabricated. This ratiometric sensor has great anti-interference capacity and excellent reversibility. In addition, it was successfully applied to monitor the pH of microorganisms, demonstrating the great potential in bioassays. This new synthetic strategy for preparing Cu NCs with tunable emission property may propose new opportunities for their applications.
8 citations
TL;DR: In this article, a new and elaborate strategy was proposed to prepare photoluminescent Cu NCs by using Cu-based metal-organic frameworks (Cu-MOFs) as the precursor.
Abstract: Copper nanoclusters (Cu NCs) have emerged as promising platform for biosensing, but it remains a challenge to fabricate highly stable Cu NCs with controllable photoluminescence. Herein, we propose a new and elaborate strategy to prepare photoluminescent Cu NCs by using Cu-based metal-organic frameworks (Cu-MOFs) as the precursor. The generated Cu NCs display ordered nanowire structure and superior stability due to the crystal structure of Cu-MOFs. Moreover, the Cu NCs possess unique pH-dependent photoluminescence property. With pH increasing, the yellow-green emission of Cu NCs at 520 nm decreases, and new cyan emission at 455 nm appears and increases gradually. This process might be related to the structure change of the Cu NCs from aggregated nanowire into dispersed spherical particle. On the basis, a facile ratiometric fluorescent sensing platform for pH is fabricated. This ratiometric sensor has great anti-interference capacity and excellent reversibility. In addition, it was successfully applied to monitor the pH of microorganisms, demonstrating the great potential in bioassays. This new synthetic strategy for preparing Cu NCs with tunable emission property may propose new opportunities for their applications.
8 citations
22 Oct 2021
5 citations
TL;DR: In this article , the synthesis, structure, and photophysical properties of a tetranuclear Cu(I)-halide cluster phosphor, [bppmCu2I2]2 (Bppm = bisdiphenylphosphinemethane), for the fabrication of high-performance white LEDs were reported.
Abstract: Solid-state lighting technology, where light-emitting diodes (LEDs) are used for energy conversion from electricity to light, is considered a next-generation lighting technology. One of the significant challenges in the field is the synthesis of high-efficiency phosphors for designing phosphor-converted white LEDs under high flux operating currents. Here, we reported the synthesis, structure, and photophysical properties of a tetranuclear Cu(I)–halide cluster phosphor, [bppmCu2I2]2 (bppm = bisdiphenylphosphinemethane), for the fabrication of high-performance white LEDs. The PL investigations demonstrated that the red emission exhibits a near-unity photoluminescence quantum yield at room temperature and unusual spectral broadening with increasing temperature in the crystalline state. Considering the excellent photophysical properties, the crystalline sample of [bppmCu2I2]2 was successfully applied for the fabrication of phosphor-converted white LEDs. The prototype white LED device exhibited a continuous rise in brightness in the range of a high bias current (100–1000 mA) with CRI as high as 84 and CCT of 5828 K, implying great potential for high-quality white LEDs.
2 citations
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TL;DR: An overview of the quick development in TADF mechanisms, materials, and applications is presented, with a particular emphasis on their different types of metal-organic complexes, D-A molecules, and fullerenes.
Abstract: The design and characterization of thermally activated delayed fluorescence (TADF) materials for optoelectronic applications represents an active area of recent research in organoelectronics. Noble metal-free TADF molecules offer unique optical and electronic properties arising from the efficient transition and interconversion between the lowest singlet (S1) and triplet (T1) excited states. Their ability to harvest triplet excitons for fluorescence through facilitated reverse intersystem crossing (T1→S1) could directly impact their properties and performances, which is attractive for a wide variety of low-cost optoelectronic devices. TADF-based organic light-emitting diodes, oxygen, and temperature sensors show significantly upgraded device performances that are comparable to the ones of traditional rare-metal complexes. Here we present an overview of the quick development in TADF mechanisms, materials, and applications. Fundamental principles on design strategies of TADF materials and the common relationship between the molecular structures and optoelectronic properties for diverse research topics and a survey of recent progress in the development of TADF materials, with a particular emphasis on their different types of metal-organic complexes, D-A molecules, and fullerenes, are highlighted. The success in the breakthrough of the theoretical and technical challenges that arise in developing high-performance TADF materials may pave the way to shape the future of organoelectronics.
1,473 citations
TL;DR: Solution-processed CsPbBr3 quantum-dot light-emitting diodes with a 50-fold external quantum efficiency improvement are achieved through balancing surface passivation and carrier injection via ligand density control, which induces the coexistence of high levels of ink stability, photoluminescence quantum yields, thin-film uniformity, and carrier-injection efficiency.
Abstract: Solution-processed CsPbBr3 quantum-dot light-emitting diodes with a 50-fold external quantum efficiency improvement (up to 6.27%) are achieved through balancing surface passivation and carrier injection via ligand density control (treating with hexane/ethyl acetate mixed solvent), which induces the coexistence of high levels of ink stability, photoluminescence quantum yields, thin-film uniformity, and carrier-injection efficiency.
977 citations
TL;DR: The Cu nanoclusters displayed apparent luminescence, with dual emissions at 425 and 593 nm, with quantum yields of 3.5 and 0.9%, respectively, and high electrocatalytic activity in the electoreduction of oxygen.
Abstract: Subnanometer-sized copper nanoclusters were prepared by a one-pot procedure based on wet chemical reduction. The structural characteristics of the 2-mercapto-5-n-propylpyrimidine-protected nanoclusters, Cun (n ≤ 8), were determined by mass spectrometry. The Cu nanoclusters displayed apparent luminescence, with dual emissions at 425 and 593 nm, with quantum yields of 3.5 and 0.9%, respectively, and high electrocatalytic activity in the electoreduction of oxygen.
398 citations
TL;DR: This paper demonstrates the significant luminescence intensity enhancement of 1-dodecanethiol (DT)-capped Cu NCs via self-assembly strategy and compares structural and optical analysis of the polymorphic NCs assemblies to establish a relationship between the compactness of assemblies and the emission.
Abstract: Metal nanoclusters (NCs) as a new class of phosphors have attracted a great deal of interest owing to their unique electronic structure and subsequently molecule-like optical properties. However, limited successes have been achieved in producing the NCs with excellent luminescent performance. In this paper, we demonstrate the significant luminescence intensity enhancement of 1-dodecanethiol (DT)-capped Cu NCs via self-assembly strategy. By forming compact and ordered assemblies, the original nonluminescent Cu NCs exhibit strong emission. The flexibility of self-assembly allows to further control the polymorphism of Cu NCs assemblies, and hence the emission properties. Comparative structural and optical analysis of the polymorphic NCs assemblies permits to establish a relationship between the compactness of assemblies and the emission. First, high compactness reinforces the cuprophilic Cu(I)···Cu(I) interaction of inter- and intra-NCs, and meanwhile, suppresses intramolecular vibration and rotation of the capping ligand of DT, thus enhancing the emission intensity of Cu NCs. Second, as to the emission energy that depends on the distance of Cu(I)···Cu(I), the improved compactness increases average Cu(I)···Cu(I) distance by inducing additional inter-NCs cuprophilic interaction, and therewith leads to the blue shift of NCs emission. Attributing to the assembly mediated structural polymorphism, the NCs assemblies exhibit distinct mechanochromic and thermochromic luminescent properties. Metal NCs-based white light-emitting diodes are further fabricated by employing the NCs assemblies with blue-green, yellow, and red emissions as phosphors.
337 citations
TL;DR: Highly luminescent and stable Cu nanoclusters have been prepared, displaying an intriguing aggregation-induced emission (AIE) feature, and the attractive AIE feature allowed the CuNCs to serve as pH stimuli-responsive functional materials.
285 citations