Above 30% External Quantum Efficiency in Blue Phosphorescent Organic Light‐Emitting Diodes Using Pyrido[2,3‐<i>b</i>]indole Derivatives as Host Materials

Lee, Chil Won; Lee, Jun Yeob

doi:10.1002/adma.201301091

Cited by 411 publications

(246 citation statements)

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“…[1][2][3][4][5][6][7][8][9] However, for high performance it is necessary to blend the triplet emitters into host matrixes to prevent self-quenching and triplet-triplet annihilation. 10,11 Recently, high external quantum efficiency over 25% has been achieved for blue and white phosphorescent OLEDs using small-molecule hosts.…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Sun¹,

Zhou

Liu³

et al. 2015

ACS Appl. Mater. Interfaces

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Shouke (2015) 'Solution-processed blue/deep blue and white phosphorescent organic light emitting diodes (PhOLEDs) hosted by a polysiloxane derivative with pendant mCP (1, 3-bis(9-carbazolyl)benzene).', ACS applied materials interfaces., 7 (51). pp. 27989-27998. Further information on publisher's website:http://dx.doi.org/10.1021/am507592sPublisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in ACS Applied Materials and Interfaces, copyright c 2015 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/am507592s. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: Introductionmentioning

confidence: 99%

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Sun¹,

Zhou

Liu³

et al. 2015

ACS Appl. Mater. Interfaces

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“…For example, Lee and Lee [ 14 ] reported an iridium(III) bis [(4,6-difl uorophenyl)-pyridinate-N,C2 ′ ]picolinate (FIrpic)-based blue OLED with an EQE of 30% at 100 cd m −2 using a pyrido [2,3-b]indole derivative as a host material. However, the driving voltages at 100 cd m −2 are very high (over 4.5 V) compared with those of low-drive-voltage green devices.…”

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confidence: 99%

Simultaneous Realization of High EQE of 30%, Low Drive Voltage, and Low Efficiency Roll‐Off at High Brightness in Blue Phosphorescent OLEDs

Udagawa

Sasabe

Igarashi

et al. 2015

Advanced Optical Materials

110

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86 wileyonlinelibrary.com COMMUNICATION challenge. For example, Lee and Lee [ 14 ] reported an iridium(III) bis [(4,6-difl uorophenyl)-pyridinate-N,C2 ′ ]picolinate (FIrpic)-based blue OLED with an EQE of 30% at 100 cd m −2 using a pyrido [2,3-b]indole derivative as a host material. However, the driving voltages at 100 cd m −2 are very high (over 4.5 V) compared with those of low-drive-voltage green devices. [ 15,16 ] Shin et al. [ 17a ] reported a FIrpic-based OLED with an EQE of 29.5% using an exciplex-forming co-host system. However, the driving voltages at 1000 cd m −2 are relatively high at around 5.0 V. Very recently, Lee et al. [ 17b ] further reduced the driving voltage of this exciplex system by changing the electron-transport layer (ETL) from B3PyMPM to PO-T2T. Therefore, reducing the drive voltage at high brightness is a critical issue in blue OLEDs.Recently, Lee et al. [ 18 ] reported a low-driving-voltage blue device using a mixed-host system consisting of two host materials: 2-(diphenylphosphoryl)spirofl uorene (SPPO1) as an n-type host material and 4,4,4-tris( N -carbazolyl)triphenylamine (TCTA) as a p-type host material. The mixed-host device showed two times higher EQE than a single-host device with SPPO1 at the high-luminance region over 1000 cd m −2 . The mixed-host device also realized a low driving voltage of 3.9 V at 1000 cd m −2 . Therefore, the use of a mixed-host system represents a promising method to realize a low drive voltage and high EQE at high brightness.In this study, we realized a high EQE of 30%, a low drive voltage, and a low effi ciency roll-off at the high-brightness region (>1000 cd m −2 ) in blue OLEDs using a mixed-host system. We used two types of host materials: TCTA as a p-type host material and 2,6-bis(3-(carbazol-9-yl)phenyl)pyridine (26DCzPPy) as an n-type host material. Consequently, the mixed-host device gave a high-performance blue OLED with a driving voltage of 3.25 V, an EQE of 32.6%, and a power efficiency of 77.6 lm W −1 at 1000 cd m −2 without any enhancement in light outcoupling. We also developed a white OLED based on this blue device and iridium(III) bis-(2-phenylquinoly-N , C 2 ′ ) dipivaloylmethane [PQ 2 Ir(dpm)] as an orange emitter. The white OLED achieved a driving voltage of 3.35 V and an EQE of 24.4% at 1000 cd m −2 .Very recently, we have reported a blue OLED with a driving voltage of 3.0 V and an EQE of 30% at 100 cd m −2 . [ 19 ] We used a carrier-and exciton-confi ning structure along with a double emission layer (DEML) strategy using high-triplet-energy ( E T ) materials. All the neighboring materials, the hole-transport layer (HTL), host materials, and ETL have higher values of E T than a blue phosphorescent emitter, fac -tris(mesityl-2-phenyl-1H-imidazole)iridium(III) [ fac -Ir(mpim) 3 ]. [ 20 ] Thereby, the quenching of the triplet excitons of fac -Ir(mpim) 3 in the EML White organic light-emitting devices (OLEDs) are expected to be used in next-generation general lighting and large display applications. [1][2][3][4][5] Phosphorescent OLE...

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“…External quantum efficiencies (EQEs) of 30% have been reported recently [1][2][3][4][5][6] ; this is considered to be the light-outcoupling efficiency limit of phosphorescent OLEDs under isotropically oriented transition dipole moments 4 . It has long been recognized that orienting the transition dipole moment of an emitter along the horizontal direction (parallel to the substrate) can enhance the outcoupling efficiency beyond that achieved under isotropic orientation, as demonstrated in polymer-based and vacuumevaporated fluorescent molecule-based OLEDs [7][8][9][10][11][12][13] .…”

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confidence: 99%

Phosphorescent dye-based supramolecules for high-efficiency organic light-emitting diodes

et al. 2014

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Organic light-emitting diodes (OLEDs) are among the most promising organic semiconductor devices. The recently reported external quantum efficiencies (EQEs) of 29-30% for green and blue phosphorescent OLEDs are considered to be near the limit for isotropically oriented iridium complexes. The preferred orientation of transition dipole moments has not been thoroughly considered for phosphorescent OLEDs because of the lack of an apparent driving force for a molecular arrangement in all but a few cases, even though horizontally oriented transition dipoles can result in efficiencies of over 30%. Here we use quantum chemical calculations to show that the preferred orientation of the transition dipole moments of heteroleptic iridium complexes (HICs) in OLEDs originates from the preferred direction of the HIC triplet transition dipole moments and the strong supramolecular arrangement within the co-host environment. We also demonstrate an unprecedentedly high EQE of 35.6% when using HICs with phosphorescent transition dipole moments oriented in the horizontal direction.

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Above 30% External Quantum Efficiency in Blue Phosphorescent Organic Light‐Emitting Diodes Using Pyrido[2,3‐b]indole Derivatives as Host Materials

Abstract: High quantum efficiencies of above 30% in blue phosphorescent organic light emitting diodes are achieved by using novel pyridoindole-based bipolar host materials. A high quantum efficiency of 30.0% is obtained at 100 cd/m(2) by using the new host materials.

Cited by 411 publications

References 23 publications

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Solution-Processed Blue/Deep Blue and White Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) Hosted by a Polysiloxane Derivative with Pendant mCP (1,3-bis(9-carbazolyl)benzene)

Simultaneous Realization of High EQE of 30%, Low Drive Voltage, and Low Efficiency Roll‐Off at High Brightness in Blue Phosphorescent OLEDs

Phosphorescent dye-based supramolecules for high-efficiency organic light-emitting diodes

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