Electronic Two-Transition-Induced Enhancement of Emission Efficiency in Polymer Light-Emitting Diodes

Ren-Ai Chen; Cong Wang; Sheng Li; Thomas F George

doi:10.3390/ma6030886

Electronic Two-Transition-Induced Enhancement of Emission Efficiency in Polymer Light-Emitting Diodes

Materials (Basel). 2013 Mar 6;6(3):886-896. doi: 10.3390/ma6030886.

Authors

Ren-Ai Chen^{1

2}, Cong Wang³, Sheng Li^{4

5

6}, Thomas F George⁷

Affiliations

¹ Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China. cra_wz_2008@163.com.
² Department of Physics, Fudan University, Shanghai 321004, China. cra_wz_2008@163.com.
³ Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China. wangimagine@gmail.com.
⁴ Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China. shenglee@zjnu.cn.
⁵ Department of Physics, Fudan University, Shanghai 321004, China. shenglee@zjnu.cn.
⁶ Office of the Chancellor and Center for Nanoscience, Departments of Chemistry & Biochemistry and Physics & Astronomy, University of Missouri-St. Louis, St. Louis, MO 63121, USA. shenglee@zjnu.cn.
⁷ Office of the Chancellor and Center for Nanoscience, Departments of Chemistry & Biochemistry and Physics & Astronomy, University of Missouri-St. Louis, St. Louis, MO 63121, USA. tfgeorge@umsl.edu.

Abstract

With the development of experimental techniques, effective injection and transportation of electrons is proven as a way to obtain polymer light-emitting diodes (PLEDs) with high quantum efficiency. This paper reveals a valid mechanism for the enhancement of quantum efficiency in PLEDs. When an external electric field is applied, the interaction between a negative polaron and triplet exciton leads to an electronic two-transition process, which induces the exciton to emit light and thus improve the emission efficiency of PLEDs.

Keywords: excitons; light-emitting diodes; polymers.