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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 291-296 |
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Ayobi A. Influence of TPD thicknesses on the performance of organic light-emitting diodes (OLEDs). ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :291-296
URL: http://opsi.ir/article-1-2362-en.html
URL: http://opsi.ir/article-1-2362-en.html
Department of Physics, Bojnourd Branch, Islamic Azad University, Bojnourd, Iran
Abstract: (919 Views)
In the present work, the influence of the N,N’ –Bis(3-methylphenyl)-N,N’ –bis(phenyl) benzidine (TPD)-like diamine thicknesses (40nm, 53nm, 60nm, 94nm and 105nm), as a hole transport layer (HTL) on the performance of organic light-emitting diodes (OLEDs) has been investigated. For fabrication of the OLED devices, thermal evaporation method has been used and it is revealed that if the thickness of TPD increases from 40 nm to 53nm and then to 60nm, 94nm and 105 nm, the current density-luminance-voltage characteristics for TPD thickness of 53nm (at voltages lower than 15 V) appear at lower voltages and for other thicknesses appear at higher voltages. So that the driving voltage and operating voltage are the highest for TPD thickness of 94nm and these quantities are decreasing for TPD thickness from 60nm to 105nm, 40nm and 53nm respectively. Also the thickness of TPD affects on current efficiency and power efficiency characteristics of OLED devices, So that these quantities are the highest for devices with TPD thickness of 60nm and 94 nm respectively.
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