EL Behavior for Blue-Emitting Aluminum Quinoline-Based Organic Light-Emitting Diodes

Mori, Toshiyuki; Itoh, Takaaki

doi:10.2494/photopolymer.22.515

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…This would also agree with the spectral shift in Fig. 3 measured between the full-stack devices and the single-carrier devices, which shows peaks corresponding to the electroluminescence peaks for BAlq3/α-NPD devices [13]. The results confirm the importance of the presence of these two layers in the OLED stack for achieving efficient charge injection of both electrons and holes.…”

Section: Device Measurement and Simulation Resultssupporting

confidence: 89%

High-Bandwidth Organic Light Emitting Diodes for Ultra-Low Cost Visible Light Communication Links

Souza

Bamiedakis

Yoshida

et al. 2018

2018 20th International Conference on Transparent Optical Networks (ICTON)

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Visible light communications (VLC) have attracted considerable interest in recent years due to an increasing need for data communication links in home and enterprise environments. Organic light-emitting diodes (OLEDs) are widely used in display applications owing to their high brightness, high quality colour-rending capability and low cost. As a result, they are attractive candidates for the implementation of ultra-low cost visible light optical links in free-space and guided-wave communications. However, OLEDs need to exhibit a bandwidth of at least ~MHz to be able to support the modest data rates (~Mbps) required in these applications. Although fluorescent OLEDs typically exhibit shorter photon lifetimes than inorganic LEDs, the bandwidth performance of the large size OLEDs used in display applications are limited by their electrical characteristics. In this work, we present a detailed physical simulation that describes well the performance of fast OLED devices that exhibit significant-3 dB bandwidths (f-3dB) of 44 MHz obtained for a 0.12 mm 2 device. It is demonstrated that the reduction of the device size results in a significant bandwidth improvement due primarily to a reduction in parasitic capacitance of the devices, though this is counteracted by carrier dynamic effects. The model provides an insight into the basic physical properties of the OLED and may be used for optimisation of future generations of OLED devices.

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Section: Device Measurement and Simulation Resultssupporting

confidence: 89%

High-Bandwidth Organic Light Emitting Diodes for Ultra-Low Cost Visible Light Communication Links

Souza

Bamiedakis

Yoshida

et al. 2018

2018 20th International Conference on Transparent Optical Networks (ICTON)

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“…5,12,13 For vacuum-deposited organic small molecules, the effect of traps on electron transport has been studied to a lesser extent. In thermally-evaporated films of Bis(8-hydroxy-2-methylquinoline)-(4phenylphenoxy)aluminum (BAlq) 14 and N,N'-Di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (α-NPD) the electron transport could be described by incorporating electron-trapping sites with a concentration of 10 24 m -3 , which is substantially higher than the typical charge concentrations under operating conditions in diodes, indicating that electron transport is heavily trap limited in these systems. [citation needed] 9 Here, we investigate two potential trapping effects, broadening of the density of states (Figure 1a) and active trapping of charges (Figure 1b) and their influence on electron transport in three different small molecule materials.…”

Section: Introductionmentioning

confidence: 99%

Molecular Origin of the Charge Carrier Mobility in Small Molecule Organic Semiconductors

Friederich

Meded

Poschlad

et al. 2016

Adv Funct Materials

108

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Future prospects of the organic light emitting diode (OLED) technology rely on the development of new organic semiconductors with optical and electronic properties outperforming those of presently available materials. Computational materials design is becoming a widely used tool to complement and accelerate experimental efforts. Computational tools were also shown to contribute to the understanding of experimentally observed phenomena. Impurities and charge traps are omnipresent in most currently available organic semiconductors and limit the charge transport and thus the efficiency of the devices. The microscopic cause as well as the chemical nature of these traps is presently not well understood. Using a multiscale model we characterize the influence of impurities on the density of states and charge transport in small-molecule amorphous organic semiconductors. We use the model to quantitatively describe the influence of water molecules and water-oxygen complexes on the electron and hole mobility by influencing the shape of the density of states and at the same time acting as explicit charge traps within the energy gap. Our results show that deep trap states introduced by molecular oxygen mainly determine the electron mobility in widely used materials such as α-NPD. TOC

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“…antimalarial, antibacterial, anticancer and antioxidant, have been attributed to these structures and has found application in the pharmaceutical industry [1][2][3][4][5][6]. Their unique spectral and photochemical properties have also found application in a variety of elds such as photolytic cleavage of DNA, electrogenerated chemiluminescence and light emitting diodes [7][8][9][10][11].…”

Section: Discussionmentioning

confidence: 99%

The crystal structure of 6-chloro-2,4-diphenylquinoline

Tonder

Visser

Koen

2016

Zeitschrift Für Kristallographie - New Crystal Structures

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EL Behavior for Blue-Emitting Aluminum Quinoline-Based Organic Light-Emitting Diodes

Cited by 7 publications

References 12 publications

High-Bandwidth Organic Light Emitting Diodes for Ultra-Low Cost Visible Light Communication Links

High-Bandwidth Organic Light Emitting Diodes for Ultra-Low Cost Visible Light Communication Links

Molecular Origin of the Charge Carrier Mobility in Small Molecule Organic Semiconductors

The crystal structure of 6-chloro-2,4-diphenylquinoline

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