Improved efficiency in fluorescent blue organic light emitting diode with a carrier confining structure

Samal, G.S.; Unni, K. N. Narayanan; Bharat, Saswat; Gupta, Shubham Umeshkumar

doi:10.1016/j.orgel.2009.06.009

Cited by 14 publications

(9 citation statements)

References 26 publications

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“…It is well established that electroluminescence and photoluminescence may not be identical since the former is basically an optical property, whereas the latter involves several electronic properties as well. We have earlier reported that the major part of the recombination happens near the HTL/EML interface due to piling up of holes near this interface . In PL, we might be able to tap all the excimers, whereas in EL, only the excimers near the HTL/EML interface can lead to excimer emission; thus, excitonic emission may still dominate.…”

Section: Resultsmentioning

confidence: 97%

Reversible Shift from Excitonic to Excimer Emission in Fluorescent Organic Light-Emitting Diodes: Dependence on Deposition Parameters and Electrical Bias

et al. 2020

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Organic light-emitting diodes (OLEDs), in general, require multilayer devices and microcavity structures for emission tuning, which increases the complexity and cost of production. Hence, it is imperative to develop techniques for spectral tuning, which employ simplified device structures. In this study, we have selected a tris(8-hydroxyquinolinato)aluminum (Alq 3 ): 10-(2benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-(1)benzopyropyrano (6,7-8-i,j)quinolizin-11-one (C545T)-based OLED and investigated the dependence of the OLED emission on various deposition parameters and the electrical bias. The concentration of the dopant in the emissive layer (EML) was varied from 3 to 50%, and the single dopant emitter as a limiting case was also studied along with studies on the varied deposition rates and EML thickness. By varying the deposition parameters, the emission was observed to change from excitonic green to excimeric yellow. With increased doping concentration, reduction in pure exciton emission with an increase in excimer emission was observed, resulting in electroluminescent spectral red shift. Similarly, electroluminescence spectra have shown different levels of broadening, depending on the deposition rate and thickness of the EML. These effects could be reversed with increasing applied electric field. Thus, it is indicated that, by suitably optimizing the deposition parameters of the dopant material, spectral tuning can easily be obtained, which may form the basis of simplified and cost-effective device structures.

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Section: Resultsmentioning

confidence: 97%

Reversible Shift from Excitonic to Excimer Emission in Fluorescent Organic Light-Emitting Diodes: Dependence on Deposition Parameters and Electrical Bias

et al. 2020

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“…In this layer, electron-hole pairs are recombined to produce photons [13]. By introducing various fluorescent and phosphorescent small molecules, the band gap energy between the HOMO and LUMO levels can be controlled [14].The simulated structure of Device 3 is shown in Fig 3. To improve the efficiency of OLEDs the Langevin recombination model is used to predict the results under proper boundary conditions.…”

Section: Device Structurementioning

confidence: 99%

Simulation and Performance Assessment of OLED for Energy Efficient Communication Display Applications

Chaudhary¹

2019

IJRASET

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OLEDs, known as organic light-emitting diodes, are a kind of technology with emitting light flat developed by inserting thin film of organic compound between two conductors, for example, a carbon dioxide on the principle of electro phosphorescence for converting electric energy into light energy in a very effective way. OLEDs technology, which is convenient for collecting more attraction of end users, is bright, lighter, thinner, more energy efficient and offers a higher contrast than liquid crystal displays. It deals with wide-angle OLEDs watches, faster response time, high contrast ratio and more saturation. The OLEDs is one of the bright lighting technologies, capable of delivering more efficient and better lighting compared to the incandescent bulbs of this fluorescent lamp. The primary goal of the work is to simulate and analyse the performance of OLEDs based on different structures and different layers, to analysis the performance of OLED by varying active layer material and to compare performance of the various OLEDs structures based on performance parameters.

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“…Normally the ITO glass is cleaned by scrubbing and sonication processes and thereafter rinsed in DI water followed by drying in an oven (Yang et al 2006). Sometimes, ITO can be subjected to other cleaning processes such as cleaning it in ethanol and acetone and followed by UV illumination (Li et al 2012) or plasma treatment (Samal et al 2009) depending on the need and availability of materials. Further, if ITO is not being used as a substrate, then it can be deposited over some other substrate such as glass by using sputtering process (Li et al 2006).…”

Section: Experimental Setup and Fabrication Proceduresmentioning

confidence: 99%

“…This is followed by deposition of different organic layers on the cleaned ITO/glass substrate by either by vacuum evaporation or by spin coating. The vacuum evaporation process is carried out at high pressure (10 -6 -10 -7 Torr) (Yang et al 2006;Samal et al 2009) and temperature ranging to 60-80°C. For spin coating process a suitable solvent is taken in which the material whose layer has to be deposited can be dissolved.…”

Section: Experimental Setup and Fabrication Proceduresmentioning

confidence: 99%

Impact of different layers on performance of OLED

2018

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This paper explores how different layers in an organic light emitting diode (OLED) impacts its performance. Here, different layers of OLED similar to hole/electron injection layer, transport layer, and block layers are analyzed. Four experimental devices are taken into consideration and their results are compared to one over another to analyze the impact of every layer. Inside depth analysis is also performed on the device to inspect what really is happening Innermost of the OLED. It is noticed that hole and electron block layer are instrumental in improving the device luminescence performance and efficiency. There is an improvement of 16, 37 and 38% in the luminescence of the device when hole block layers and electron block layers are added. Internal device analysis reveals that increase in charge carrier concentration and carrier confinement are the reason for this improvement.

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Improved efficiency in fluorescent blue organic light emitting diode with a carrier confining structure

Cited by 14 publications

References 26 publications

Reversible Shift from Excitonic to Excimer Emission in Fluorescent Organic Light-Emitting Diodes: Dependence on Deposition Parameters and Electrical Bias

Reversible Shift from Excitonic to Excimer Emission in Fluorescent Organic Light-Emitting Diodes: Dependence on Deposition Parameters and Electrical Bias

Simulation and Performance Assessment of OLED for Energy Efficient Communication Display Applications

Impact of different layers on performance of OLED

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