Luminescent zinc(<scp>ii</scp>) and copper(<scp>i</scp>) complexes for high-performance solution-processed monochromic and white organic light-emitting devices

Cheng, Gang; So, Gary Kwok Ming; To, Wai‐Pong; Chen, Yong; Kwok, Chi Chung; Ma, Chensheng; Guan, Xiangguo; Chang, Xiaoyong; Kwok, Wai Ming; Ming, Chi

doi:10.1039/c4sc03161j

Cited by 139 publications

(82 citation statements)

References 91 publications

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“…The maximum power efficiencies (PEs) of the WOLEDs were also measured to be 0.30, 0.25, and 0.13 lm/W for devices A, B, and C, respectively. Even though these LE and PE values are low in comparison to those reported for phosphoresce and TADF‐based WOLEDs,, they are comparable with the best values reported in the literature for thermally‐processed fluorescent zinc(II)‐based WOLEDs (0.12 to 2.1 cd/A for LE and 0.038 to 1.17 lm/W for PE) . It is important to note that the gradual decrease in the device efficiency of devices B and C compared with device A is due to the fact that, as mentioned above, the turn‐on voltages of these devices increase by increasing the doping concentration.…”

Section: Resultssupporting

confidence: 78%

“…Solution‐processing is technically less complicated, inexpensive, and therefore highly attractive for large‐area manufacturing purposes . However, to date, reports on solution‐processed zinc(II) complex‐based OLEDs are scarce . Moreover, to the best of our knowledge, there has been no report on solution‐processed WOLEDs based on zinc(II) complexes with AIE behavior.…”

Section: Introductionmentioning

confidence: 99%

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A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

et al. 2018

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The synthesis, characterization, photophysical and redox properties of a dinuclear complex Zn 2 (AMOX) 4 (AMOX = 4-bromo-N,N′-diphenylbenzamidinate N-oxide) are highlighted. This compound is a first example of a novel class of aggregation-induced emission (AIE) materials. Noticeably, solution-processed white-green organic light-emitting diodes were fabricated using this complex as dopant in a co-host matrix in the [a] 4324 gands. This distinction indicates that the energy of the LUMO can be fine-tuned by modifying the C-aryl substituents with EW/ED groups. The TD-DFT calculations for 1 ( Figure S10, Table Eur.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

et al. 2018

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“…Charge‐neutral luminescent Cu I complexes containing 7,8‐bis(diphenylphosphino)‐7,8‐dicarba‐ nido ‐undecaborate (dppnc) ligands have been widely studied . Sterically bulky carborane‐containing ligands show a unique electronic effect and thermal stability, and can be used to tune the photoluminescent properties, intermolecular interactions, concentration quenching behavior and hydrophilicity of luminescent metal complexes.…”

Section: Resultsmentioning

confidence: 99%

Efficient Color‐Tunable Copper(I) Complexes and Their Applications in Solution‐Processed Organic Light‐Emitting Diodes

Cheng

Wang

et al. 2017

Chemistry An Asian Journal

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As eries of dppnc-and neocuproine-based Cu I complexes (dppnc = 7,8-bis(diphenylphosphino)-7,8-dicarbanido-undecaborate) are synthesized and the emission color of these Cu I complexes can be tuned from green to deep red via rational modification of the neocuproine ligand structure. The molecular structures of the emissive Cu I complexes, Cu(dppnc)-G (green emitting), Cu(dppnc)-Y (yellow emitting),a nd Cu(dppnc)-R( red emitting), are characterized and their electronic structures and related transition properties are elucidated by photo-physical and computational (density functional theory) studies. The calculation results suggest that thermally activated delayed fluorescence (TADF) is the emission mechanism for these Cu I complexes. Efficient solution-processedg reen-,y ellow-, and red-emitting OLEDs are fabricated based on the emissive complexes as the dopants. High external quantum efficiency (EQE) of 15.20 %a nd current efficiencyo f4 8.15 cd A À1 at 1000 cd m À2are achieved in the green-emitting device with Cu(dppnc)-G. Am aximum EQE of 10.17 %, CIE coordinates of (0.61, 0.38) and am aximum electroluminescent peak of 631 nm are achieved in the red device based on Cu(dppnc)-R.

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“…The emission energy of 5 can be tuned by using host materials with different band‐gaps. By using a higher band‐gap material PYD2 (2,6‐dicarbazolo‐1,5‐pyridine), to replace PVK:OXD‐7 as the host, the emission peak maximum of the device with 5 further blue‐shifts to 486 nm with CIE coordinates of (0.21, 0.42) (Figure S17). The maximum EQE of this device is 15.7 % which slightly decreased to 14.4 % at 1000 cd m −2 (Figure S18).…”

Section: Figurementioning

confidence: 99%

Highly Luminescent Pincer Gold(III) Aryl Emitters: Thermally Activated Delayed Fluorescence and Solution‐Processed OLEDs

et al. 2017

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Herein are described the synthesis, photophysical properties and applications of a series of luminescent cyclometalated Au complexes having an auxiliary aryl ligand. These complexes show photoluminescence with emission quantum yields of up to 0.79 in solution and 0.84 in thin films (4 wt % in PMMA) at room temperature, both of which are the highest reported values among Au complexes. Thermally activated delayed fluorescence (TADF) is the emission origin for some of these complexes. Solution-processed OLEDs made with these complexes showed sky-blue to green electroluminescence with external quantum efficiencies (EQEs) of up to 23.8 %, current efficiencies of up to 70.4 cd A , and roll-off of down to 1 %, highlighting the bright prospect of Au -TADF emitters in OLEDs.

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Luminescent zinc(ii) and copper(i) complexes for high-performance solution-processed monochromic and white organic light-emitting devices

Abstract: High performance orange (EQE up to 15.64%) and white (EQE up to 6.88%) solution processed OLEDs fabricated solely with emitters of non-platinum group metals were reported. The white device has CIE coordinates of (0.42, 0.44) and CRI of 81.

Cited by 139 publications

References 91 publications

A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

Efficient Color‐Tunable Copper(I) Complexes and Their Applications in Solution‐Processed Organic Light‐Emitting Diodes

Highly Luminescent Pincer Gold(III) Aryl Emitters: Thermally Activated Delayed Fluorescence and Solution‐Processed OLEDs

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