2018
DOI: 10.1002/ejic.201800579
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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

Abstract: 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 modi… Show more

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Cited by 10 publications
(9 citation statements)
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“…Zinc(II) compounds are used in OLEDs as in various applications, such as emitters, host materials, and hole injection layers. [ 86,175 ] A number of OLEDs including WOLEDs using Zinc(II) complexes as emitters have been reported by different groups [ 29,176–179 ] ; however, no TADF Zn(II) complex was reported until 2015 when Adachi and co‐workers published the first examples in green OLEDs (Table 9 and Scheme ). [ 29 ] These new TADF complexes showed very high PLQY of 78.4% and 58.4% with Φ TADF = 66.1% and 48.1% for Zn1 and Zn2 respectively (Table 8).…”
Section: Organometallic Tadf Compounds For Lightingmentioning
confidence: 99%
“…Zinc(II) compounds are used in OLEDs as in various applications, such as emitters, host materials, and hole injection layers. [ 86,175 ] A number of OLEDs including WOLEDs using Zinc(II) complexes as emitters have been reported by different groups [ 29,176–179 ] ; however, no TADF Zn(II) complex was reported until 2015 when Adachi and co‐workers published the first examples in green OLEDs (Table 9 and Scheme ). [ 29 ] These new TADF complexes showed very high PLQY of 78.4% and 58.4% with Φ TADF = 66.1% and 48.1% for Zn1 and Zn2 respectively (Table 8).…”
Section: Organometallic Tadf Compounds For Lightingmentioning
confidence: 99%
“…The obtained quantum yield of up to 18.4% for the ideal white-light point II-D ( x = 0.323, y = 0.333; CCT of 8533 K and CRI of 75) under excitation at 345 nm is the highest among all reported Zn 2+ -complex-doping systems. 22,23 The 2.8 ns lifetime of the PVK-incorporated blue light ( λ em = 419 nm) and the [Zn2(MP)3(OAc)] -centered yellow light ( λ em = 540 nm) lifetime of 77 ns confirm that the optimal dichromatic white light should have unambiguous fluorescence characteristics. Interestingly, as for the polymer Poly(NVK-co-[Zn2(MP)3(OAc)]) (300 : 1), although all the integrated points III-A–D ( x = 0.258–0.265, y = 0.296–0.305) also fall into the blue–white-light regime (Fig.…”
Section: Resultsmentioning
confidence: 82%
“…First, besides a lower V on of 6.0 V, the dichromatic white light ( Fig. 5(d and e) ; CIE coordinates of x = 0.325–0.329, y = 0.300–0.310; CCTs of 7050–7318 K and CRIs of 82–84) can be stable within an extended applied bias voltage range of 6.0–15.0 V, and L Max (46.2 cd m −2 ) is slightly increased with a lower J of 6.7 mA cm −2 at 15.0 V. More importantly, its maximum efficiencies ( η Max c = 13.0 cd A −1 , η Max p = 6.1 lm W −1 and η Max EQE = 9.2%) reformed almost 5–6 times more than those of the WPLED-I and are the best (Table S7 † ) among reported Zn( ii )-complex-based WOLEDs 16–20 /WPLEDs, 22,23 to our knowledge. Furthermore, within the stable illuminating range, the high efficiencies ( η c = 9.1 cd A −1 , η p = 4.4 lm W −1 and η EQE = 6.8%) are maintained, with distinctively weaker efficiency roll-off ( ca .…”
Section: Resultsmentioning
confidence: 95%
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“…The electroluminescence (EL) properties achieved by zinc (II) complexes were checked: peak luminance (L max ) of 3589 cd m −2 , maximal external quantum efficiency (η ext ) of 1.46%, maximum current efficiency (η L ) of 4.1 cd A −1 , and maximal power efficiency (η P ) of 3.8 lm W −1 . Garry S. Hanan and coworkers in 2018 [ 121 ] synthesised a dinuclear complex of zinc (II) with 4-bromo- N , N ′-diphenylbenzamidinate N-oxide. This compound is a Zn AIEgen and was used as a dopant in a co-host matrix of the emissive layer used in the fabrication of a solution-processed white–green WOLED.…”
Section: Zn Aiegens For Oleds and Other Optical Technologiesmentioning
confidence: 99%