"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

A comparative study on the performances of organic light-emitting diodes with C60 and C70 cathode buffer layer

WENJIA LI1,* , LINA S1, JIAN REN1, JIAQI WU2

Affiliation

  1. Huaiyin Normal University, Huaian 223300, China
  2. Suntech Power Co. Ltd., Wuxi 214028, China

Abstract

Organic light-emitting diodes based on Alq3 (8-hydroxyquinoline aluminum) were fabricated using C60 and C70 as cathode buffer layer, respectively. The results showed that EL performances of OLEDs using C70- buffer-layer were better than that of C60- buffer-layer. The mechanisms of enhancement were systemically discussed on the energy level difference of the heterojunction, conductivity of the materials and electron transport and quantum current distribution in the two kinds of fullerene molecules. The degradation of the two kinds of OLEDs exposed in air without encapsulation was also studied. It was found that OLEDs using C70 as cathode buffer layer showed a better stability. This is because C60 can be easily destroyed by oxygen than C70. Thus, C70 cathode buffer layer can not only increase the EL characteristics, but also dramatically improve the stability of OLEDs..

Keywords

Organic light-emitting diodes, Cathode buffer layer, C 60 , C 70 , Degradation.

Citation

WENJIA LI, LINA S, JIAN REN, JIAQI WU, A comparative study on the performances of organic light-emitting diodes with C60 and C70 cathode buffer layer, Optoelectronics and Advanced Materials - Rapid Communications, 13, 3-4, March-April 2019, pp.195-201 (2019).

Submitted at: Aug. 21, 2018

Accepted at: April 8, 2019