Pyridoindole Derivative as Electron Transporting Host Material for Efficient Deep‐blue Phosphorescent Organic Light‐emitting Diodes

Fukagawa, Hirohiko; Yokoyama, Norimasa; Irisa, Shiro; Tokito, Shizuo

doi:10.1002/adma.201001221

Cited by 80 publications

(46 citation statements)

References 27 publications

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“…When a pyridine ring is fused to an indole skeleton, the carboline unit is formed. 35 The electron-only device indicates its higher ET ability than the famous UGH2 host. In order to evaluate the potential carboline unit for developing hosts with EI/ET ability, a series of carboline-based compound have been prepared (Fig.…”

Section: 323mentioning

confidence: 99%

“…1). For example, besides the function of coordinating to the central metal ions, 28,29 functional units containing nitrogen atoms can be used to enhance the hole injection/transporting (HI/HT) abilities [30][31][32] or electron injection/transporting (EI/ET) properties [33][34][35] of phosphorescent emitters and host materials depending on the different hybrid modes of the nitrogen atom. Thus, the design and synthesis of new phosphorescent emitters and their host materials represent two research focuses in the PHOLED field to improve the device performance.…”

Section: Introductionmentioning

confidence: 99%

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Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

2015

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Phosphorescent organic light-emitting devices (OLEDs) have attracted increased attention from both academic and industrial communities due to their potential practical application in high-resolution full-color displays and energy-saving solid-state lightings. The performance of phosphorescent OLEDs is mainly limited by the phosphorescent transition metal complexes (such as iridium(III), platinum(II), gold(III), ruthenium(II), copper(I) and osmium(II) complexes, etc.) which can play a crucial role in furnishing efficient energy transfer, balanced charge injection/transporting character and high quantum efficiency in the devices. It has been shown that functionalized main-group element (such as boron, silicon, nitrogen, phosphorus, oxygen, sulfur and fluorine, etc.) moieties can be incorporated into phosphorescent emitters and their host materials to tune their triplet energies, frontier molecular orbital energies, charge injection/transporting behavior, photophysical properties and thermal stability and hence bring about highly efficient phosphorescent OLEDs. So, in this review, the recent advances in the phosphorescent emitters and their host materials functionalized with various main-group moieties will be introduced from the point of view of their structure-property relationship. The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.

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Section: 323mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

2015

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“…Substituted pyridoindoles have emergeda sanovel class of fluorophores with tunable photophysical properties with promisingb iological and optoelectronic applications. [39][40][41][42] Our systematic investigations with as eries of substituted pyrido[1,2-a]indoles,r evealed that one of the derivatives 6,7,8,9-tetrapropylpyrido[1,2-a]indole-10-carbaldehyde (TPIC) exhibitedavery high fluorescence quantum yield in solution (F f % 80 %i nD MSO)a nd was employed for subcellular imaging. [39] However,t he fluorescence of TPIC is completely quenched in the aggregated and solid state duet ot he aggregation-caused-quenching (ACQ)e ffect.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Förster Resonance Energy Transfer through a Self‐Assembly Approach for Efficient White‐Light Emission in an Aqueous Medium

Pallavi

Ahir

et al. 2017

Chemistry A European J

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A simple and cost-effective methodology employing environmentally benign substances for the fabrication of white-light emitting materials is important for practical applications in the field of lighting and display devices. Designing purely organic-based white-light-emitting systems with high quantum efficiency in aqueous media is an unmet challenge. With this objective, a new class of pyridoindole-based hydrophobic fluorophore 6,7,8,9-tetrapropylpyrido[1,2-a]indole-10-carbaldehye (TPIC) was introduced. A strategy of self-assembly using nonionic surfactants was employed to enhance the fluorescence of TPIC in an aqueous medium and was exploited as energy donor. The steady-state and time-resolved emission spectra analysis revealed the micelle-mediated energy transfer from TPIC to Nile red (energy acceptor) leading to tunable fluorescence along with white-light emission. The white-light emitting aqueous solution was obtained with the Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of (0.33, 0.36) and significantly high quantum yield of 37 %. Solid-state white-light emission was achieved retaining the assembly of fluorophores in the form of a gel having the high quantum efficiency of 33 % with CIE coordinates of (0.32, 0.36); close to that of pure white light. The bright white luminescence of the inscription prepared using white-light emitting gel on a solid substrate offers promising applications for full-color flat panel displays.

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“…[7,8] To minimize these bad effects, the phosphors are normally dispersed in a host matrix as emitting guests. [11][12][13][14][15] Therefore, the full-color and white OLEDs were often established based on a complicated material system. [9,10] To realize OLED applications in flat-panel display and solid-state illumination, three primary colors (RGB: red, green and blue) OLEDs are generally necessary.…”

Section: Introductionmentioning

confidence: 99%

A Bipolar and Small Singlet‐Triplet Splitting Energy Host with Triplet Energy Lower Than a Blue Phosphor for Phosphorescent OLEDs in Panchromatic Range

Wang

Liu

et al. 2016

Chin. J. Chem.

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A bipolar host material, 2,4,6-tris(3-(carbazol-9-yl)phenyl)-triazine (TCPZ), was synthesized according to reported method. Due to the higher triplet energy compared to green and red phosphors, TCPZ is suitable to host them in phosphorescent organic light-emitting diodes (PhOLEDs). Although the triplet of TCPZ is slightly lower than a common blue phosphor, good blue PhOLEDs using TCPZ as the host were successfully demonstrated in this work. By low temperature emission measurement, it was found that the energy splitting between the singlet and triplet of TCPZ is as small as 0.24 eV. Therefore, thermal activated energy transfer from triplet to singlet in the host TCPZ is expected to occur, which can be afterwards efficiently transferred to the blue phosphor, hence enabling it to host blue phosphor. As a result, TCPZ can be used as host for phosphors in panchromatic range. Additionally, single-carrier devices clearly prove its good bipolar transport feature, beneficial to device performance. By using TCPZ as a host, high performance deep-red, green and blue PhOLEDs have been achieved, with maximum efficiencies of 9.3 cd•A 1 (13.2%), 81.3 cd•A 1 (23.1%) and 17.03 cd•A 1 (10.4%), respectively.

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Pyridoindole Derivative as Electron Transporting Host Material for Efficient Deep‐blue Phosphorescent Organic Light‐emitting Diodes

Cited by 80 publications

References 27 publications

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices

Tuning the Förster Resonance Energy Transfer through a Self‐Assembly Approach for Efficient White‐Light Emission in an Aqueous Medium

A Bipolar and Small Singlet‐Triplet Splitting Energy Host with Triplet Energy Lower Than a Blue Phosphor for Phosphorescent OLEDs in Panchromatic Range

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