A Novel Ambipolar Spirobifluorene Derivative that Behaves as an Efficient Blue-Light Emitter in Organic Light-Emitting Diodes

Liao, Yuan‐Li; Lin, Chi-Yen; Wong, Ken‐Tsung; Hou, Tei-Hung; Hung, Wen‐Yi

doi:10.1021/ol701994k

Cited by 96 publications

(34 citation statements)

References 21 publications

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“…[ 17 ] The same reason can be applied to explain the difference between 13 [ 18 ] and 14 . [ 19 ] 14 can be viewed as a dimer of 13 . The PLQYs of fi lms made from 13 and 14 were 0.80 and 0.41, and the peak EQEs were 2.5% and 0.53%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Strategies to Design Bipolar Small Molecules for OLEDs: Donor‐Acceptor Structure and Non‐Donor‐Acceptor Structure

et al. 2011

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Organic light-emitting diodes (OLEDs) have attracted great attention because of their potential applications in full-color displays and solid-state lights. In the continual effort to search for ideal materials for OLEDs, small molecules with bipolar transporting character are extremely attractive as they offer the possibility to achieve efficient and stable OLEDs even in a simple single-layer device. In this Research News, we review the two design strategies of bipolar materials for OLEDs: molecules with or without donor-acceptor structures. The correlation between the experimental results and theoretical calculations of some of the materials is also discussed.

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Section: Introductionmentioning

confidence: 99%

Strategies to Design Bipolar Small Molecules for OLEDs: Donor‐Acceptor Structure and Non‐Donor‐Acceptor Structure

et al. 2011

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“…Although several spirobifluorene compounds bearing donor and acceptor residues have been synthesized and employed for example as dyes [19][20][21] or as ambipolar transporting molecules, [22,23] to the best of our knowledge, no experimental data on their hyperpolarizability β have yet been reported. The first hyperpolarizability of spiro-linked push-pull polyenes, where several 1,4-cyclohexadiene rings are connected by the tetrahedral sp 3 carbon atoms and electron-donating and electron-withdrawing groups are introduced in the terminal 1,4-cyclohexadiene rings, has been investigated by using ab initio and INDO/S molecular orbital calculations.…”

Section: Introductionmentioning

confidence: 99%

A Joint Experimental and Theoretical Investigation on Nonlinear Optical (NLO) Properties of a New Class of Push–Pull Spirobifluorene Compounds

et al. 2010

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A new class of push-pull spirobifluorene compounds 1-5 has been synthesized. The nonlinear optical (NLO) properties (first and second hyperpolarizability β and γ, respectively) of spirobifluorene derivatives have been investigated for the first time using electric field induced second harmonic (EFISH) and third harmonic generation (THG) methods. Moreover, a comparison with the corresponding push-pull

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“…52 By incorporating small amounts of a narrow band gap DA polymer with more n-type properties into the emitting layer, great improvement in device performance is expected due to reduced charge trapping and improved energy transfer mechanisms. 53,54 To begin, three different molar ratios of GO were used to investigate the dependence of lm transparency and charge transport, beside device EL properties. Fig.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

A novel ambipolar polymer: from organic thin-film transistors to enhanced air-stable blue light emitting diodes

et al. 2014

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The search for developing a deep blue long-lasting polymer light-emitting diode (PLED) has focused attention on polyfluorene (PFO) keto defect suppression with physical and chemical modifications. This study presents the synthesis and characterization of a new donor-acceptor (DA) polymer, based on naphthalene diimide (NDI) as a strong acceptor and n-phenyl-dithieno[3,2-b:2 0 ,3 0 -d]pyrrole (DTP) as a strong donor. This polymer exhibits ambipolar behavior with stronger n-type properties, 0.07 cm 2 V À1 s À1 , versus p-type 0.006 cm 2 V À1 s À1 . By blending PNDIT-alt-DTP into PFO with hole and electron trapping sites, significantly enhanced electroluminescence (EL) efficiency in a simplified polymer lightemitting diode (PLED) was achieved. Further improvement is also achieved by introducing graphene oxide (GO) into the hole injection layer of PEDOT:PSS. A pure and strong long-lasting blue-color in a wide range of bias voltages can be acquired upon introducing 5.0 wt% PNDIT-alt-DTP and 0.01 wt% GO.New blend devices have lower turn-on voltages of 3.5 V, compared to 7.0-8.0 V for pure PFO PLEDs, high current efficiency up to 3.8 cd A À1 and maximum luminance exceeding 5500 cd m À2 which are at least 20 and 60 times greater than a pure PFO/0.01GO device, respectively. The enhanced efficiency can be related to improved hole injection and electron blocking nature of the GO doped PEDOT:PSS layer as well as reducing singlet exciton quenching at the interface. Additionally, the spatial confinement effect of the ambipolar polymer efficiently enhances the thermal stability of the binary blend and facilitates charge carrier balance and more efficient radiative recombination in the devices. These values are among the highest ever reported for PFO devices doped with an ambipolar polymer working in air.

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A Novel Ambipolar Spirobifluorene Derivative that Behaves as an Efficient Blue-Light Emitter in Organic Light-Emitting Diodes

Cited by 96 publications

References 21 publications

Strategies to Design Bipolar Small Molecules for OLEDs: Donor‐Acceptor Structure and Non‐Donor‐Acceptor Structure

Strategies to Design Bipolar Small Molecules for OLEDs: Donor‐Acceptor Structure and Non‐Donor‐Acceptor Structure

A Joint Experimental and Theoretical Investigation on Nonlinear Optical (NLO) Properties of a New Class of Push–Pull Spirobifluorene Compounds

A novel ambipolar polymer: from organic thin-film transistors to enhanced air-stable blue light emitting diodes

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