Efficiency enhancement in tandem organic light-emitting devices with a hybrid charge generation layer composed of BEDT-TTF-doped TPBi/mCP/HAT-CN

Kim, Dae Hun; Kim, Tae Whan

doi:10.1016/j.orgel.2014.09.031

Cited by 22 publications

(3 citation statements)

References 26 publications

(29 reference statements)

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“…[1][2][3][4] Their external quantum efficiency (EQE) is affected via tuning their electron-hole recombination, spin static factor, photoluminescence efficiency, and out-coupling efficiency. [5][6][7] Although the internal quantum efficiency (h int ) of OLEDs has been increased ($100%), their external quantum efficiency is comparatively low ($30%) for applications in mass production. [8][9][10][11][12][13][14] Metal-enhanced luminescence has been analysed using silver and gold nanoparticles [15][16][17] due to their surface plasmon resonance (SPR), and other metals such as copper 18 and aluminium 19 and semiconducting materials such as zinc oxide 20 have also been reported to enhance luminescence and device lifetime.…”

Section: Introductionmentioning

confidence: 99%

A dodecanethiol-functionalized Ag nanoparticle-modified ITO anode for efficient performance of organic light-emitting devices

et al. 2017

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The electroluminescence intensity of a dodecanethiol-functionalized silver (DT-Ag) NP/ CPB:Ir(mpidmb) 2 (acac) film was increased by about 2.23 times in comparison with that of a control device, CPB:Ir(mpidmb) 2 (acac), due to coupling between excitons of emissive layer and the localized surface plasmon resonance (LSPR) of DT-Ag NPs. The current efficiency of a device with a DT-Ag NPs layer at 100 cd cm À2 (42.3 cd A À1) was 17.0 cd A À1 higher than that of the control device (25.3 cd A À1).The increase in current efficiency in the case of DT-Ag NP-coated devices was strongly related to the energy transfer between radiated light generated from the CBP:Ir(mpidmb) 2 (acac) emissive layer and the LSPR excited by the DT-Ag NPs layer.

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Section: Introductionmentioning

confidence: 99%

A dodecanethiol-functionalized Ag nanoparticle-modified ITO anode for efficient performance of organic light-emitting devices

et al. 2017

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“…[1][2][3] To fabricate highly efficient devices, the incorporation of hole injection layers (HILs) is indispensable because these significantly improve the characteristics of hole injection from the anode to the emitting layer, leading to lower driving voltages and improved charge recombination balance. To date, various HILs have been reported, [4][5][6][7][8][9][10][11][12][13][14][15] and, among these, 1,4,5,8,9, 11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) has been employed in HILs (leading to low driving voltage) 4,[16][17][18][19][20][21][22] since the first application of OLED by LG Chemical Ltd. 22 HAT-CN was first reported by Czarnik and co-workers 23 and its characterization has been investigated in various studies. [24][25][26][27][28][29] The most remarkable property of HAT-CN is the extremely deep energy level of its lowest unoccupied molecular orbital.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of solution-processed 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile crystallization by mixing additives for hole injection layers in organic light-emitting devices

Takahashi

Chiba

et al. 2016

Polym J

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We report the inhibition of solution-processed 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) crystallization by mixing additives for the hole injection layers (HILs) in organic light-emitting devices (OLEDs). Various additives were mixed with the HAT-CN layer, including acrylates, compounds resembling HAT-CN and arylamine derivatives. Among these, the HAT-CN films mixed with ditrimethylol propane tetraacrylate (AD-TMP) and pyrazino[2,3-f][1,10]phenanthroline-2,3-dicarbonitrile (PPDN) showed a transparent appearance and high solvent resistances. The former was ascribed to the inhibition of the crystallization. We used these additives for the preparation of electron acceptor layers in charge generation layers (CGLs) of the CGL-only devices. The device prepared by mixing HAT-CN with PPDN showed a lower driving voltage and was applied to the production of an HIL in a solution-processed OLED. The device showed a lower driving voltage and a higher luminescent efficiency than those of the device containing a conventional HIL, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT:PSS).

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“…However, a low efficiency was obtained without adding an ion electrolyte. Therefore, a conventional buffer layer of 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HAT-CN), which is widely used in semiconductor devices, − was inserted between TPD and the Au electrode. As a result, the photovoltaic performance was significantly improved.…”

Section: Introductionmentioning

confidence: 99%

Improved Hole-Transporting Property via HAT-CN for Perovskite Solar Cells without Lithium Salts

Ma¹,

Chung²,

Zheng³

et al. 2015

ACS Appl. Mater. Interfaces

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A nonadditive hole-transporting material (HTM) of a triphenylamine derivative of N,N'-di(3-methylphenyl)-N,N'-diphenyl-4,4'-diaminobiphenyl (TPD) is used for the organic-inorganic hybrid perovskite solar cells. The power conversion efficiency (PCE) can be significantly enhanced by inserting a thin layer of 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HAT-CN) without adding an ion additive because the hole-transporting properties improve. The short-circuit current density (J(sc)) increases from 8.5 to 13.1 mA/cm(2), the open-circuit voltage (V(oc)) increases from 0.84 to 0.92 V, and the fill-factor (FF) increases from 0.45 to 0.59, which corresponds to the increase in PCE from 3.2% to 7.1%. Moreover, the PCE decreases by only 10% after approximately 1000 h without encapsulation, which suggests an alternative method to improve the stability of perovskite solar cells.

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Efficiency enhancement in tandem organic light-emitting devices with a hybrid charge generation layer composed of BEDT-TTF-doped TPBi/mCP/HAT-CN

Cited by 22 publications

References 26 publications

A dodecanethiol-functionalized Ag nanoparticle-modified ITO anode for efficient performance of organic light-emitting devices

A dodecanethiol-functionalized Ag nanoparticle-modified ITO anode for efficient performance of organic light-emitting devices

Inhibition of solution-processed 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile crystallization by mixing additives for hole injection layers in organic light-emitting devices

Improved Hole-Transporting Property via HAT-CN for Perovskite Solar Cells without Lithium Salts

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