Admittance of oled structures with YAK-203 emission layer | Izvestiya vuzov. Fizika. 2019. № 2.

Admittance of oled structures with YAK-203 emission layer

The current-voltage characteristics and the admittance of multilayer structures for organic LEDs based on the PEDOT:PSS/NPD/YAK-203/BCP system have been experimentally investigated in a wide range of measurement conditions. It is shown that at voltages corresponding to the effective radiative recombination of charge carriers, a significant decrease in the differential capacitance of the structures is observed. The frequency dependences of the normalized conductance of LED structures are in good agreement with the results of numerical simulation in the framework of the equivalent circuits method. Changes in the frequency dependences of the admittance with a change in temperature are most pronounced in the range of 200-300 K and less noticeable in the temperature range of 8-200 K. From the frequency dependences of the imaginary part of the impedance, carrier mobilities are found at various voltages and temperatures. The mobility values obtained by the method used are somewhat lower than the values determined by the transient electroluminescence method. The dependence of the mobility on the electric field is well approximated by a linear function; as the temperature decreases from 300 to 220 K, the mobility decreases several times.

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Keywords

адмиттанс, вольт-амперная характеристика, светодиодная структура, органический полупроводник, метод эквивалентных схем, частотная зависимость мнимой части импеданса, подвижность носителей заряда, переходная электролюминесценция, organic semiconductor, LED structure, current-voltage characteristic, admittance, method of equivalent circuits, frequency dependence of imaginary part of impedance, charge carrier mobility, transient electroluminescence

Authors

Name	Organization	E-mail
Voitsekhovskii A.V.	National Research Tomsk State University; Siberian Physical-Technical Institute V.D. Kuznetsova Tomsk State University	vav43@mail.tsu.ru
Nesmelov S.N.	National Research Tomsk State University	nesm69@mail.ru
Dzyadukh S.M.	National Research Tomsk State University	bonespirit@mail2000.ru
Kopylova T.N.	Siberian Physical-Technical Institute V.D. Kuznetsova Tomsk State University	kopylova@phys.tsu.ru
Degtyarenko K.M.	Siberian Physical-Technical Institute V.D. Kuznetsova Tomsk State University	norma1954@yandex.ru
Kokhanenko A.P.	National Research Tomsk State University	kokh@mail.tsu.ru

Всего: 6

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