Enhancement of Quantum Efficiency of Organic Light Emitting Devices by Doping Magnetic Nanoparticles

Journal Article · Mon Jan 01 00:00:00 EST 2007 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2746415· OSTI ID:931770

Sun, Chengjun ^[1]; Wu, Yue ^[1]; Xu, Zhihua ^[1]; Hu, Bin ^[2]; Bai, Jianmin ^[3]; Wang, Jian-Ping ^[3]; Shen, Jian ^[1]

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1. ORNL
2. University of Tennessee, Knoxville (UTK)
3. University of Minnesota

Magnetic nanoparticles of CoFe are used as dopants to enhance the quantum efficiency of electroluminance in a single layer organic light emitting device (OLED). The enhancement of quantum efficiency increases with both increasing density of CoFe nanoparticles and external magnetic field. For a given OLED with 0.1 wt % doping, the enhancement of the quantum efficiency reaches {approx}27% and {approx}32% without and with a magnetic field, respectively. The origin of these improvements could be attributed to the simultaneous increases of the portion of excitons among total charge carriers and the fraction of singlets among the total excitons

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931770
• Journal Information: Applied Physics Letters, Vol. 90, Issue 23; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGE CARRIERS
EXCITONS
MAGNETIC FIELDS
ORIGIN
QUANTUM EFFICIENCY