A combinational molecular design to achieve highly efficient deep-blue electrofluorescence

Bian, Mengying; Zhao, Zifeng; Liu, Yu; Li, Qing; Chen, Zhijian; Zhang, Dongdong; Wang, Shufeng; Bian, Zuqiang; Liu, Zhiwei; Xiao, Lixin

doi:10.1039/c7tc04685e

Cited by 50 publications

(25 citation statements)

References 42 publications

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“…BCPO, CzSi, TSPO1, TPBi, Bphen and LiF were purchased from Luminescence Technology Corp. TPEA was provided by the authors of literature35 .Synthesis ofCe-1 KTp Me2 (2.02 g, 6 mmol), Ce(CF 3 SO 3 ) 3 (1.17 g, 2 mmol), H 2 O (0.036 g, 2 mmol), and dry THF (50 mL) were added to a 100 mL round-bottom flask. The mixture was stirred in a glovebox at room temperature for 3 days.…”

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confidence: 99%

Deep-blue organic light-emitting diodes based on a doublet d–f transition cerium(III) complex with 100% exciton utilization efficiency

et al. 2020

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Compared to red and green organic light-emitting diodes (OLEDs), blue OLEDs are still the bottleneck due to the lack of efficient emitters with simultaneous high exciton utilization efficiency (EUE) and short excited-state lifetime. Different from the fluorescence, phosphorescence, thermally activated delayed fluorescence (TADF), and organic radical materials traditionally used in OLEDs, we demonstrate herein a new type of emitter, cerium(III) complex Ce-1 with spin-allowed and parity-allowed d–f transition of the centre Ce3+ ion. The compound exhibits a high EUE up to 100% in OLEDs and a short excited-state lifetime of 42 ns, which is considerably faster than that achieved in efficient phosphorescence and TADF emitters. The optimized OLEDs show an average maximum external quantum efficiency (EQE) of 12.4% and Commission Internationale de L’Eclairage (CIE) coordinates of (0.146, 0.078).

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Deep-blue organic light-emitting diodes based on a doublet d–f transition cerium(III) complex with 100% exciton utilization efficiency

et al. 2020

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“…[66] By using a combinational molecular design, a deep blue emitter 1-(10-(4-methoxyphenyl)anthracen-9-yl)-4-(10-(4-cyanophenyl)anthracen-9-yl)tetraphenylethene (TPEA) has been successfully synthesized, which integrated TTF, HLCT and AIE. [29] In addition, a donoracceptor (D-A) structure was adopted to improve charge balance in OLEDs. The crystallographic structure exhibits that the two anthracene groups are distorted from the central TPE moiety, effectively preventing the emission from red shifting (as shown in Figure 4(a)).…”

Section: To Enhance Triplet Utilization By a Combinational Molecular mentioning

confidence: 99%

“…For blue emitters, based on the effect of molecular configuration on photoelectric properties, we proposed a promising way of combinational molecular design for a novel deep blue emitter close to the standard blue of Commission Internationale de l'É clairage (CIE) coordinates (0.14, 0.08) of National Television Standards Committee (NTSC), the device efficiency of which was beyond the theoretical limitation. [27][28][29] Considering charge transport materials, we came up with a novel strategy to develop an electron transport material (ETM) to balance carrier transport in the device, and nearly 100 % of internal quantum efficiency (h int ) has been achieved. [30][31][32][33] Investigating the coupling mechanisms of surface plasmon polaritons (SPP) and waveguide modes between free photons in OLED, the light out-coupling efficiency was dramatically improved by using a mesoscopic photonic structure.…”

Section: Introductionmentioning

confidence: 99%

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Highly Efficient Organic Blue Electroluminescent Materials and Devices with Mesoscopic Structures

Bian

Chen

Xiao

2018

The Chemical Record

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Due to the difficulty in achieving high efficiency and high color purity simultaneously, blue emission is the limiting factor for the performance and stability of OLEDs. Since 2003, we have been working on organic light-emitting diodes (OLEDs), especially on blue light. After a series of molecular designs, novel strategies have been proposed from different aspects. At first, highly efficient deep blue emission could be achieved through molecular design with highly twisted structure to suppress fluorescence quenching and redshift. Deep blue emitters with high efficiency in solid state, a twisted structure with aggregation induced emission (AIE) characteristics was incorporated to inhibit molecular aggregation, and triplet-triplet fusion (TTF) and hybridized localized charge transfer (HLCT) were adopted to increase the ratio of triplet exciton used. Secondly, a highly efficient blue OLED could be achieved through improving charge transport. New electron transport materials (ETMs) with wide band gap were developed to control charge transport balance in devices. Thirdly, a highly efficient deep blue emission could be achieved through a mesoscopic structure of out-coupling layer. A mesoscopic photonic structured organic thin film was fabricated on the top of metal electrode by self-aggregation in order to improve the light out-coupling efficiency.

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“…Despite the promise of utilizing the extraordinary electrical, optical, and mechanical properties of CNTs at very small concentrations (0.1 wt.%) in polymer, limited progress has been made toward realizing the full potential of CNTs. Possible explanations are, but not limited to: (1) the natural tendency for CNTs to aggregate during processing because of strong van Der Waals’ forces, (2) the covalent functionalization of CNTs to control dispersion, leads to disruption of conjugation in CNTs and scattering of electrons from each covalent functionalized site, with consequent deterioration in electrical and transport properties, and (3) the noncovalent functionalization approach is characterized by a weak CNT‐polymer interface. In order to overcome the aforementioned problems, a method of hybrid functionalized CNTs is proposed.…”

Section: Introductionmentioning

confidence: 99%

Study on the performance of syntactic foam reinforced by hybrid functionalized carbon nanotubes

Wang

Meng

et al. 2019

J of Applied Polymer Sci

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Hollow glass microspheres (HGMs)/epoxy syntactic foam were reinforced by hybrid functionalized carbon nanotubes that were synthesized by simultaneous covalent and noncovalent functionalization of carbon nanotubes. The effect of hybrid functionalized carbon nanotubes on density, mechanical properties, and water absorption of HGMs/epoxy syntactic foam was studied. The study indicated that the dispersion of carbon nanotubes in epoxy resin can be improved by hybrid functionalization. The compression strength of syntactic foam reinforced by hybrid functionalized carbon nanotubes was significantly enhanced. The maximum compressive strength of syntactic foam corresponding to chitosan modified carbon nanotubes approached 60 MPa. Hybrid functionalized carbon nanotubes had little effect on the water absorption ability of syntactic foam, and was less than 1%.

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A combinational molecular design to achieve highly efficient deep-blue electrofluorescence

Abstract: A novel high-performance deep-blue emitting material TPEA that combines the merits of AIE and TTF plus HLCT is demonstrated.

Cited by 50 publications

References 42 publications

Deep-blue organic light-emitting diodes based on a doublet d–f transition cerium(III) complex with 100% exciton utilization efficiency

Deep-blue organic light-emitting diodes based on a doublet d–f transition cerium(III) complex with 100% exciton utilization efficiency

Highly Efficient Organic Blue Electroluminescent Materials and Devices with Mesoscopic Structures

Study on the performance of syntactic foam reinforced by hybrid functionalized carbon nanotubes

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