Efficiency enhancement of organic light-emitting diodes using mesoporous titanium-oxide scattering nanoparticles

Choi, Hyekyung; Kim, Chanho; Chae, Heeyeop; Cho, Sung Min

doi:10.1016/j.matlet.2017.11.102

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…A micro pattern is a key component of various functional devices, such as a solar cell [1], biochip [2], wearable device [3], flexible electronics [4], organic light-emitting diode [5], thin film transistor [6], electronic skin [7], electronic newspaper [8], flexible electronic display [9], etc. Recently, these functional devices have attracted much attention from researchers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on Organic Micro Patterns Fabricated on a Flexible Substrate Using the Near-Field Electrohydrodynamic Direct-Writing Method

Chen

Zhang

et al. 2019

Micromachines

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A micro pattern is a key component of various functional devices. In the present study, using the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) mixed material as the direct-writing solution and photographic paper as the flexible insulating substrate, the organic micro patterns of various shapes, such as the curve of the second-order self-similar structure, the helical curve, and the wave curve, were fabricated on the flexible insulating substrate by using the near-field electrohydrodynamic direct-writing method. The effects of process parameters, such as the applied voltage, direct-writing height, flow rate of the injection system, and moving velocity of the substrate, on the width and the conductivity of the organic micro patterns were studied in the near-field electrohydrodynamic direct-writing process. The results show that the width of an organic micro pattern increases with the increase of the applied voltage of the high-voltage power supplier and the flow rate of the injection system under the condition where the three other process parameters remained constant, respectively, while the width of an organic micro pattern decreases with the increase of the direct-writing height and the moving velocity of the flexible substrate, respectively. The fabricated organic microcircuit patterns of the natural drying in air at room temperature were tested by a thin film thermoelectric tester at a detection temperature. The results show that the conductivity of a fabricated organic micro pattern decreases with the increase of the electric field intensity, while the effect of moving velocity and the flow rate on the conductivity is small under the condition where the three other process parameters remained constant.

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Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on Organic Micro Patterns Fabricated on a Flexible Substrate Using the Near-Field Electrohydrodynamic Direct-Writing Method

Chen

Zhang

et al. 2019

Micromachines

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“…This is particularly prominent at the cathode side, where air-stable aluminum (Al) with a high W F (∼4.1 eV) is used as a stable alternative to the low W F alkali metals such as barium (Ba, W F ∼2.2 eV) and calcium (Ca, W F ∼2.7 eV) metals [19][20][21]. Transition metal oxides, such as zinc oxide (ZnO) [22][23][24][25][26], titanium dioxide (TiO 2 ) [27][28][29][30], and zirconium oxide (ZrO 2 ) [31,32], have been successfully employed as electron injection layers (EILs) in inverted OLEDs due to their robustness, good electron transport ability and high transparency in the visible wavelength range. However, they usually require thermal post treatment at relatively high temperature that hinders their application to conventional device structures, where the EIL is deposited on top of the organic emitter.…”

Section: Introductionmentioning

confidence: 99%

Commercially available chromophores as low-cost efficient electron injection layers for organic light emitting diodes

Verykios¹,

Soultati²,

Tourlouki³

et al. 2022

J. Phys. D: Appl. Phys.

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Further advancements in organic light emitting diodes (OLEDs) using commercially available, low-cost materials is of high significance. Here, we report the application of commercially available chromophores as room temperature processed electron injection layers (EILs) in the conventional OLED architecture. The facile solution-processing of these chromophores, namely, 4‐dimethylamino‐4'‐nitrostilbene (DANS) and 1‐(4‐(dimethylamino)phenyl)‐6‐phenyl‐1,3,5‐hexatriene (DMA-DPH), along with the presence of nitrogen atom in their structure, which is expected to induce the formation of a negative interfacial dipole at the cathode interface, have motivated their use as EILs. Improved performance of the OLEDs using these chromophores was obtained. Especially, the OLED using DANS exhibited the highest luminous efficiency (LE), power efficiency (PE) and external quantum efficiency (EQE) values of 8.7 cd A-1, 6.75 lm W-1 and 2.9%, respectively, which represented a significant improvement compared to the reference device without the EIL (1.2 cd A-1, 0.7 lm W-1 and 0.4%, respectively). A variety of experimental and simulated results demonstrated that this enhancement is attributed to increased electron injection leading to balanced electron and hole currents, especially in the DANS embedding device. Additionally, we calculated significant broadening of the emission zone profile across the entire organic emitter in the devices using the chromophores, thus increasing the probability of radiative recombination and photon emission.

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“…It was also observed that unipolar p-type behavior of MoTe 2 flakes with Ti/Au metal contact and environmental oxygen can tune the device from ambipolar to unipolar p-type [11]. 2D layered nanomaterials are advantageous for gas-sensing applications due to their high surface-to-volume ratio, which facilitates surface reactions [20,21,22,23]. For chemiresistive-type FET gas sensors, electrical resistivity or conductivity are altered upon adsorption of target molecules on the surface of 2D nanomaterials [19,24,25].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Polarity of MoTe2 FETs by Varying the Channel Thickness for Gas-Sensing Applications

Rani

DiCamillo

Khan

et al. 2019

Sensors

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In this study, electrical characteristics of MoTe2 field-effect transistors (FETs) are investigated as a function of channel thickness. The conductivity type in FETs, fabricated from exfoliated MoTe2 crystals, switched from p-type to ambipolar to n-type conduction with increasing MoTe2 channel thickness from 10.6 nm to 56.7 nm. This change in flake-thickness-dependent conducting behavior of MoTe2 FETs can be attributed to modulation of the Schottky barrier height and related bandgap alignment. Change in polarity as a function of channel thickness variation is also used for ammonia (NH3) sensing, which confirms the p- and n-type behavior of MoTe2 devices.

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Efficiency enhancement of organic light-emitting diodes using mesoporous titanium-oxide scattering nanoparticles

Cited by 14 publications

References 8 publications

Effect of Process Parameters on Organic Micro Patterns Fabricated on a Flexible Substrate Using the Near-Field Electrohydrodynamic Direct-Writing Method

Effect of Process Parameters on Organic Micro Patterns Fabricated on a Flexible Substrate Using the Near-Field Electrohydrodynamic Direct-Writing Method

Commercially available chromophores as low-cost efficient electron injection layers for organic light emitting diodes

Tuning the Polarity of MoTe2 FETs by Varying the Channel Thickness for Gas-Sensing Applications

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