Multilayer Structures and Emissive Regions in Organic Thin-Film Electroluminescent Diodes

1995 ◽  
Vol 413 ◽  
Author(s):  
E. Aminaka ◽  
T. Tsutsui
Keyword(s):  
Thin Film ◽  
Single Layer ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Organic Thin Film ◽  
Emission Efficiency ◽  
Narrow Region ◽  
Carrier Recombination ◽  
Emissive Region ◽  
High Emission

ABSTRACTThe relationships between emission quantum efficiency and emissive regions in organic thin-film electroluminescent (EL) devices were studied. As an emissive layer (EML) and an electron transport layer (ETL) material, 9, 10-bis(4-diphenylaminostyryl)anthracene and 1,3- bis(4-tert-butylphenyl-1,3,4-oxadiazolyl)phenylene, respectively, were used. A zone doped with 2,4-bis(4-diethylamino-2-hydroxyphenyl)-1,3-dihydroxycycrobutenediylium dihydroxide was formed in an EML. The relationships between the emission intensities from the dopant and the positions of doped zones gave information on the emissive regions in each EL device. The emissive region in the single-layer (SL) device consisting only of an EML extended over the EML. That in the two-layer device (DL-E) in which an EML was combined with an ETL was located within 10 nm-wide region near the EML/ETL boundary. Moreover, the emission efficiency of the DL-E device was found to be about 20 times as high as that of the SL device. Therefore, it was found that the carrier recombination within the narrow region sufficiently apart from electrodes gave high emission efficiency.

scholarly journals Characteristic Evaluation of Organic Light-Emitting Diodes Prepared with Stamp Printing Technique

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Apisit Chittawanij ◽  
Kitsakorn Locharoenrat
Keyword(s):  
Thin Film ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Organic Thin Film ◽  
Light Emitting ◽  
Force Microscopy ◽  
Organic Light ◽  
Printing Technique

We have reported on a stamp printing technique that uses PET release film as a printing stamp to deposit TPBi thin film served as the electron transport layer of the organic light-emitting diodes. TPBi thin film was printed with a good uniformity and resolution. Effect of deposition conditions on optical and electrical properties and surface roughness of TPBi thin film have been studied under spectroscopy and atomic force microscopy, respectively. It is found that characteristic of TPBi thin film is improved via controlled stamp temperature and time. Since TPBi thin film exhibits the surface morphology comparable to that of conventional spin-coating thin film, our findings suggest that PET release film-based stamp printing approach is possible to use as an alternative deposition of the organic thin film as compared with a traditional one.

Development of the Structural, Optical, and Electrical Properties of PEDOT:PSS Conducting Polymer Thin Film for Energy Applications

2021 ◽  
Vol 902 ◽  
pp. 65-70
Author(s):  
Samar Aboulhadeed ◽  
Mohsen Ghali ◽  
Mohamad M. Ayad
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrical Properties ◽  
Conducting Polymer ◽  
Film Surface ◽  
Volume Ratio ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Optical And Electrical Properties ◽  
Energy Applications

We report on a development of the structural, optical and electrical properties of poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT:PSS) conducting polymer thin films. The PEDOT:PSS thin films were deposited by a controlled thin film applicator and their physical properties were found to be effectively modified by isopropanol. The deposited films were investigated by several techniques including XRD, UV–Vis, SPM and Hall-effect. Interestingly, by optimizing the PEDOTS:PSS/ISO volume ratio (v:v), we find that the film charge carriers type can be switched from p to n-type with a high bulk carriers concentration reaching 6×1017 cm-3. Moreover, the film surface roughness becomes smoother and reaching a small value of only 1.9 nm. Such development of the PEDOT:PSS film properties makes it very promising to act as an electron transport layer for different energy applications.

Spray deposited gallium doped zinc oxide (GZO) thin film as the electron transport layer in inverted organic solar cells

Solar Energy ◽  
2022 ◽  
Vol 231 ◽  
pp. 458-463
Author(s):  
Sanjay Kumar Swami ◽  
Neha Chaturvedi ◽  
Anuj Kumar ◽  
Vinod Kumar ◽  
Ashish Garg ◽  
...  
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Solar Cells ◽  
Electron Transport ◽  
Organic Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer

Hybrid Bilayer Heterojunction Al/ZnPc/ZnO /ITO Thin Films Solar Cell Prepared by Pulsed Laser Deposition

2020 ◽  
Vol 78 (2) ◽  
pp. 12-21
Author(s):  
Mohammed T. Hussein ◽  
Mohammed Jawad H. Kadhim
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Pulsed Laser Deposition ◽  
Indium Tin Oxide ◽  
Short Circuit ◽  
Pulsed Laser ◽  
Transport Layer ◽  
Laser Deposition ◽  
Electron Transport Layer ◽  
Xenon Lamp

Hybrid bilayer heterojunction Zinc Phthalocyanine (ZnPc) thin-film P-type is considered as a donor active layer as well as the Zinc Oxide (ZnO) thin film n-type is considered as an acceptor with (Electron Transport Layer). In this study, using the technique of Q-switching Nd-YAG Pulsed Laser Deposition (PLD) under vacuum condition 10-3 torr on two ITO (Indium Tin Oxide) and (AL) electrodes and aluminum, is used to construct the hydride bilayer photovoltaic solar cell heterojunction (PVSC). The electrical properties of hybrid heterojunction Al/ZnPc/ZnO/ITO thin film are studied. The results show that the voltage of open circuit (V_oc=0.567V), a short circuit (I_sc=36 ?A), and the fill factor (FF) of 0.443. In addition, the conversion efficiency of (n=3.4%) is recorded with Xenon lamp with an intensity 235mw/cm2 .

Organic Thin Film Transistors Fabricated by a Solution Process Using Direct Patterned Single-Layer Graphene Electrodes

2020 ◽  
Vol 20 (10) ◽  
pp. 6435-6440
Author(s):  
Do-Kyung Kim ◽  
Jae-Hyung Han ◽  
Muhan Choi. ◽  
Jin-Hyuk Bae
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Soft Lithography ◽  
Solution Process ◽  
Single Layer ◽  
Organic Thin Film Transistors ◽  
Single Layer Graphene ◽  
Metal Catalyst ◽  
Organic Thin Film ◽  
Layer Graphene

We propose the direct transfer method of single-layer graphene (SLG) from metal catalyst Cu-foil to a polymeric insulator and the direct patterning method of the SLG for electrodes of organic thin-film transistors (OTFTs) without contamination using soft-lithography. Through soft-lithography, SLG can be formed in various patterns relatively easily in comparison with the conventional photolithography method that has multiple complex process steps to make graphene patterns. Furthermore, the 6,13-bis(triisopropylsilylethynyl) pentacene OTFTs are fabricated in solution with SLG source and drain electrodes. As a result, the field-effect mobility of OTFTs based on SLG electrodes was enhanced about 4 times in comparison with that of OTFTs using typical metal electrodes due to the decrease in contact resistance.

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