Red emissive organic light-emitting diodes based on codeposited inexpensive Cu<sup>I</sup> complexes

Ni, Tianchi; Liu, Xiaochen; Zhang, Tao; Bao, Hongliang; Zhan, Ge; Jiang, Nan; Wang, Jianqiang; Liu, Zhiwei; Bian, Zuqiang; Lu, Zheng‐Hong; Huang, Chunhui

doi:10.1039/c5tc00727e

Cited by 17 publications

(2 citation statements)

References 45 publications

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“…These two kinds of hybrid materials have obvious differences in luminescence, stability and other properties, due to their differences in structural types and coordination [10] . Copper(I) halide hybrid luminescent materials have many advantages such as structure diversity, facile synthesis, high luminescent efficiency and tunable optical performance, exhibiting great promise in solid‐state‐lightings and displays [9b,15] . However, compared with the properties of commercial rare‐earth metal based phosphors, the reported compounds typically have poor stability, complicated synthetic procedures, low luminescent efficiency.…”

Section: Introductionmentioning

confidence: 99%

New Strategy for Optimizing the Properties of Copper Halide Organic‐Inorganic Hybrid Lighting‐emitting Materials

Liu

Zhou

et al. 2022

Chemistry A European J

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Copper(I) halide organic‐inorganic hybrid luminescent materials have many advantages, such as diverse structure, facile synthesis, high luminescent efficiency, tunable optical performance, etc., and show a broad application prospect in energy‐saving lighting, display and other fields. However, compared with commercial rare‐earth‐metal‐based phosphors, the reported hybrids generally suffer from poor stability and low luminescent efficiency, which are the bottleneck problem of their practical application. With the aim of developing high‐performance organic‐inorganic hybrid luminescent materials, a new synthesis strategy has been reported. This strategy can systematically design and synthesis copper(I) halide ionic hybrid structures by combining the covalent bonding and ionic bonding between inorganic and organic components into one structure, and use their synergistic effect to optimizing their properties. This design method is expected to develop high‐performance organic‐inorganic hybrid luminescent materials, promote the in‐depth understanding of this field, and provide new ideas for the optimization of other types of hybrid materials.

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Section: Introductionmentioning

confidence: 99%

New Strategy for Optimizing the Properties of Copper Halide Organic‐Inorganic Hybrid Lighting‐emitting Materials

Liu

Zhou

et al. 2022

Chemistry A European J

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“…Organic light-emitting devices (OLEDs) have been attracting great interest for their applications in flat panel displays and solid-state lighting. − A lot of work on material research and device engineering has been reported both in fluorescent devices and phosphorescent devices. Blue emitters, one of the key components for a full-color display, can also serve as hosts for lower energy dopant emitters by energy transfer to generate emission of other colors due to their intrinsic large energy gaps. , However, stable blue-emitting materials and devices still need to be explored as compared to the red or green ones. − Among the efforts to achieve excellent blue-emitting materials, designing bipolar molecules with donor and acceptor motifs seems to be an effective way because such materials can usually exhibit good electron mobility as well as hole mobility, thus leading to the simplification of device fabrication by replacing complicated multilayer devices with comparatively simple devices. ,− …”

Section: Introductionmentioning

confidence: 99%

AIE-Active Fluorene Derivatives for Solution-Processable Nondoped Blue Organic Light-Emitting Devices (OLEDs)

Feng

Peng

et al. 2015

ACS Appl. Mater. Interfaces

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A series of fluorene derivatives end-capped with diphenylamino and oxadiazolyl were synthesized, and their photophysical and electrochemical properties are reported. Aggregation-induced emission (AIE) effects were observed for the materials, and bipolar characteristics of the molecules are favored with measurement of carrier mobility and calculation of molecular orbitals using density functional theory (DFT). Using the fluorene derivatives as emitting-layer, nondoped organic light-emitting devices (OLEDs) have been fabricated by spin-coating in the configuration ITO/PEDOT:PSS(35 nm)/PVK(15 nm)/PhN-OF(n)-Oxa(80 nm)/SPPO13(30 nm)/Ca(8 nm)/Al(100 nm) (n = 2-4). The best device with PhN-OF(2)-Oxa exhibits a maximum luminance of 14 747 cd/m(2), a maximum current efficiency of 4.61 cd/A, and an external quantum efficiency (EQE) of 3.09% in the blue region. Investigation of the correlation between structures and properties indicates that there is no intramolecular charge transfer (ICT) increase in these molecules with the increase of conjugation length. The device using material of the shortest conjugation length as emitting-layer gives the best electroluminescent (EL) performances in this series of oligofluorenes.

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Construction of High‐Quality Cu(I) Complex‐Based WOLEDs with Dual Emissive Layers Achieved by an “On‐and‐Off” Deposition Strategy

Tan

et al. 2019

Advanced Optical Materials

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for their wide range of commercial applications including energy-efficient solidstate lighting, backlights for liquid-crystal displays (LCDs), and full-color OLEDs. [1] Nevertheless, in comparison with their commercial competitor white lightemitting diodes (WLEDs), which are based on inorganic materials, there are still urgent challenges for WOLEDs to further simplify device structures, lower costs, and improve the quality of white light.Generally, white emission light can be achieved through either the combination of two complementary colors or three primary colors (RGB), where the former strategy features in simpler structure but is hard to satisfy daily lighting due to relatively low color-rendering index (CRI) while the latter one leads to better CRI but requires multiple emissive layers (EMLs) in devices. Moreover, the cost for high-efficiency WOLEDs is significantly increased by introducing phosphorescent materials. The utilization of precious metal complexes (e.g., iridium, platinum, and osmium) ensures to harness the energies of both the singlet and triplet excitons to give internal quantum efficiencies of 100% [2] but sets great obstacles for future commercialization due to their low abundance and unclear toxicity.With the aim of surmounting the challenges above, Cu(I) complexes provide potential alternatives for a realistic approach to low-cost and high-efficiency devices due to their excellent photoluminescence, color-tuning features, and eco-friendliness. Till now, intensive research has been conducted in OLEDs based on Cu(I) complexes which can be comparable to that of iridium complex OLEDs. [3] Despite high-profile progress in green emissive OLEDs, it remains challenging to design efficient orange or red Cu(I) complexes, which play a key role to achieve white light. More importantly, tradition methods for OLEDs fabrication (e.g., vacuum deposition or spin coating) cannot be applied to most emissive Cu(I) complexes due to their instability during sublimation and poor solubility in common solvents. To expand the use of Cu(I) emissive complexes and simplify device fabrication in OLEDs, we have demonstrated a codeposition (CD) method to make Cu(I) complexes as emitters for OLEDs. [4] This method involves codeposition of CuI and a nitrogen-coordinating ligand/host compound to form a Cu(I) complex-doped EML in situ, where the ligand Inexpensive and highly luminescent Cu(I) complexes exhibit great potential as emitters in organic light-emitting diodes (OLEDs), especially in white OLEDs (WOLEDs). In this work, two compounds 9-(3-(quinolin-4-yl)phenyl)-9H-carbazole (CzPQ) and 9,9′-(quinoline-4,6-diylbis(3,1-phenylene))bis(9Hcarbazole) (2CzPQ) are designed and synthesized to form Cu(I) complexes in situ by codeposition with copper iodide (CuI). The corresponding OLEDs show an orange red emission with a maximum external quantum efficiency (EQE) of 6.7%. Based on this result, an "on-and-off " strategy is proposed to achieve WOLEDs with the combination of Cu(I) complex layer and the pure ligand layer by contr...

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Red emissive organic light-emitting diodes based on codeposited inexpensive Cu^I complexes

Abstract: Red emissive CuI complexes and their organic light-emitting diodes were prepared by codeposition of CuI and isoquinoline based ligands.

Cited by 17 publications

References 45 publications

New Strategy for Optimizing the Properties of Copper Halide Organic‐Inorganic Hybrid Lighting‐emitting Materials

New Strategy for Optimizing the Properties of Copper Halide Organic‐Inorganic Hybrid Lighting‐emitting Materials

AIE-Active Fluorene Derivatives for Solution-Processable Nondoped Blue Organic Light-Emitting Devices (OLEDs)

Construction of High‐Quality Cu(I) Complex‐Based WOLEDs with Dual Emissive Layers Achieved by an “On‐and‐Off” Deposition Strategy

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Red emissive organic light-emitting diodes based on codeposited inexpensive CuI complexes

Abstract: Red emissive CuI complexes and their organic light-emitting diodes were prepared by codeposition of CuI and isoquinoline based ligands.

Cited by 17 publications

References 45 publications

New Strategy for Optimizing the Properties of Copper Halide Organic‐Inorganic Hybrid Lighting‐emitting Materials

New Strategy for Optimizing the Properties of Copper Halide Organic‐Inorganic Hybrid Lighting‐emitting Materials

AIE-Active Fluorene Derivatives for Solution-Processable Nondoped Blue Organic Light-Emitting Devices (OLEDs)

Construction of High‐Quality Cu(I) Complex‐Based WOLEDs with Dual Emissive Layers Achieved by an “On‐and‐Off” Deposition Strategy

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Red emissive organic light-emitting diodes based on codeposited inexpensive Cu^I complexes