Gate-Tunable Electron Injection Based Organic Light-Emitting Diodes for Low-Cost and Low-Voltage Active Matrix Displays

2017 ◽  
Vol 9 (20) ◽  
pp. 16750-16755 ◽  
Author(s):  
Xinning Luan ◽  
Jiang Liu ◽  
Qibing Pei ◽  
Guillermo C. Bazan ◽  
Huaping Li
Keyword(s):  
Light Emitting Diodes ◽  
Low Voltage ◽  
Low Cost ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Active Matrix ◽  
Light Emitting ◽  
Organic Light ◽  
Active Matrix Displays

Green-synthesized, low-cost tetracyanodiazafluorene (TCAF) as electron injection material for organic light-emitting diodes

2019 ◽  
Vol 30 (11) ◽  
pp. 1969-1973 ◽  
Author(s):  
Bing Yang ◽  
Jianfeng Zhao ◽  
Zepeng Wang ◽  
Zhenlin Yang ◽  
Zongqiong Lin ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Low Cost ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Injection Material ◽  
Organic Light

Single-Carrier Devices for the Understanding of the Voltage Drift in Organic Light Emitting Diodes

2011 ◽  
Vol 1359 ◽  
Author(s):  
J. Boizot ◽  
V. Gohri ◽  
H. Doyeux
Keyword(s):  
Light Emitting Diodes ◽  
Low Voltage ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Constant Current ◽  
Light Emitting ◽  
Single Carrier ◽  
Organic Light ◽  
Voltage Drift

ABSTRACTThe aim of this study is to analyze and mitigate the voltage drift phenomenon observed in top-emitting organic light emitting diodes (OLED) when driven at constant current. An operating device may experience voltage increase over time due to factors such as interface or bulk material degradation, charge accumulation and formation of trap states. Single-carrier devices were fabricated to understand the contribution to voltage drift from each of these causes. Doping in electron injection layer (4, 7-diphenyl-1,10-phenanthroline or Bphen) and hole injection layer (2,2’,7,7’-tetra(N,N-di-tolyl)amino-spiro-bifluorene or Spiro-TTB) were optimized to obtain ohmic injection contacts. Devices with tris(8-hydroxy-quinoline) aluminium (Alq3) degrade significantly with holes injection and undergo high voltage increase in lifetime test measurements. On the contrary, devices with N,N’-di(naphtalen-1-y1)-N,N’-diphenyl-benzidine (NPB) exhibit an ambipolar charge transport behavior and low voltage drift under both hole and electron injection.

Organic Electronics: Successes in Organic Light Emitting Diodes and Display Technology

2012 ◽  
Vol 736 ◽  
pp. 241-249 ◽  
Author(s):  
Deepak
Keyword(s):  
Organic Semiconductors ◽  
Light Emitting Diodes ◽  
Single Crystal Silicon ◽  
Organic Light Emitting Diodes ◽  
Crystal Silicon ◽  
Active Matrix ◽  
Light Emitting ◽  
Organic Light ◽  
Active Matrix Displays ◽  
Display Technology

Whereas single crystal silicon limited to 300 mm in diameter dominates the bulk of electronic devices, when electronics is required on a larger scale we have to rely on either amorphous or multi-crystalline materials. In this category, the organic semiconductors have made rapid in-roads. Among their applications, most notable successes are organic light emitting diodes (OLEDs) based displays. But, these OLEDs could also be made to emit in ultraviolet (UV) as shown through polysilanes devices. Two materials that we have investigated emit in UV or near UV. The emission spectrum could be manipulated by modifying the side groups on the main Si chain. Further discussed in the paper are full colour passive matrix displays we have made and development of thin films transistor for moving towards active matrix displays.

Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer

2005 ◽  
Vol 86 (3) ◽  
pp. 033503 ◽  
Author(s):  
Takahito Oyamada ◽  
Hiroyuki Sasabe ◽  
Chihaya Adachi ◽  
Seiichiro Murase ◽  
Tsuyoshi Tominaga ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Light Emitting Diodes ◽  
Low Voltage ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Electron Injection Layer ◽  
Organic Light

scholarly journals Unravelling the electron injection/transport mechanism in organic light-emitting diodes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tsubasa Sasaki ◽  
Munehiro Hasegawa ◽  
Kaito Inagaki ◽  
Hirokazu Ito ◽  
Kazuma Suzuki ◽  
...  
Keyword(s):  
Work Function ◽  
Transport Mechanism ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Materials Used

AbstractAlthough significant progress has been made in the development of light-emitting materials for organic light-emitting diodes along with the elucidation of emission mechanisms, the electron injection/transport mechanism remains unclear, and the materials used for electron injection/transport have been basically unchanged for more than 20 years. Here, we unravelled the electron injection/transport mechanism by tuning the work function near the cathode to about 2.0 eV using a superbase. This extremely low-work function cathode allows direct electron injection into various materials, and it was found that organic materials can transport electrons independently of their molecular structure. On the basis of these findings, we have realised a simply structured blue organic light-emitting diode with an operational lifetime of more than 1,000,000 hours. Unravelling the electron injection/transport mechanism, as reported in this paper, not only greatly increases the choice of materials to be used for devices, but also allows simple device structures.

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