Low driving voltage organic light emitting diode using phenanthrene oligomers as electron transport layer

2008 ◽  
Vol 516 (23) ◽  
pp. 8717-8720 ◽  
Author(s):  
Hsiao-Wen Hung ◽  
Norimasa Yokoyama ◽  
Masayuki Yahiro ◽  
Chihaya Adachi
Keyword(s):  
Electron Transport ◽  
Light Emitting Diode ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Driving Voltage ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

The Study of Organic Light Emitting Diode with a Doped Electron Transport Layer

2007 ◽  
Author(s):  
Cheng-Chieh Hou ◽  
Ruei-Shiang Shieh ◽  
Shui-Hsiang Su ◽  
Chung-Ming Wu ◽  
Meiso Yokoyama
Keyword(s):  
Electron Transport ◽  
Light Emitting Diode ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

scholarly journals Improvement in Device Performance and Reliability of Organic Light-Emitting Diodes through Deposition Rate Control

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Shun-Wei Liu ◽  
Chih-Chien Lee ◽  
Yu-Ting Chung ◽  
Jiun-Haw Lee ◽  
Chin-Ti Chen ◽  
...  
Keyword(s):  
Deposition Rate ◽  
Light Emission ◽  
Light Emitting Diode ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Driving Voltage ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Operating Lifetime

We demonstrated a fabrication technique to reduce the driving voltage, increase the current efficiency, and extend the operating lifetime of an organic light-emitting diode (OLED) by simply controlling the deposition rate of bis(10-hydroxybenzo[h]qinolinato) beryllium (Bebq2) used as the emitting layer and the electron-transport layer. In our optimized device, 55 nm of Bebq2was first deposited at a faster deposition rate of 1.3 nm/s, followed by the deposition of a thin Bebq2(5 nm) layer at a slower rate of 0.03 nm/s. The Bebq2layer with the faster deposition rate exhibited higher photoluminescence efficiency and was suitable for use in light emission. The thin Bebq2layer with the slower deposition rate was used to modify the interface between the Bebq2and cathode and hence improve the injection efficiency and lower the driving voltage. The operating lifetime of such a two-step deposition OLED was 1.92 and 4.6 times longer than that of devices with a single deposition rate, that is, 1.3 and 0.03 nm/s cases, respectively.

Enhancement in electron transport and exciton confinement in OLEDs: role of n-type doping and electron blocking layers

2019 ◽  
Vol 86 (1) ◽  
pp. 10201 ◽  
Author(s):  
Anjaly Soman ◽  
K.N. Narayanan Unni
Keyword(s):  
Electron Transport ◽  
High Efficiency ◽  
Light Emitting Diode ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
The One

Doped transport layers are essential for achieving high efficiency in organic light emitting diodes (OLEDs). We have studied the effect of doping the electron transport layer (ETL), tris-(8-hydroxyquinoline) aluminum (Alq3) with different percentages of lithium fluoride (LiF). We have also studied the effect of different electron blocking layers (EBLs) such as Tris (4-carbazoyl-9-ylphenyl)amine (TCTA), N,N'-Bis (naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine(NPB), and Di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC) in an Alq3:2,3,6,7-Tetrahydro-1,1,7,7,-tetramethyl-1H, 5H, 11H −10-(2-benzothiazolyl)quinolizino[9,9a, 1gh] coumarin (C545T) based organic light emitting diode (OLED) with optimized ETL doping. TCTA was found to effectively block the electrons and influence the recombination region in the process. At a brightness of 1000 cd/m2, an improvement of 27.8% was observed in external quantum efficiency (EQE) for the device with TCTA as the EBL and doped Alq3 as the ETL, compared to the one with just NPB as both EBL and HTL.

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