Translator Disclaimer
27 August 2009 Electroluminescence-detected magnetic resonance study of OLEDs containing a mixed N,N'-diphenyl-N,N'-bis(1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPB)/tris(quinolinolate) Al (Alq3) layer
Author Affiliations +
Abstract
The electroluminescence (EL)-detected magnetic resonance (ELDMR) of abrupt junction and mixed layer N,N'-diphenyl-N,N'-bis(1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPB) / tris(quinolinolate) Al (Alq3) OLEDs was measured at room temperature and at 20K, at current densities 0.83 ≤ J ≤ 83 mA/cm2. The abrupt junction and mixed layer devices were indium tin oxide (ITO) / 5 nm copper phthalocyanine (CuPc) / 50 nm NPB / 40 nm Alq3 / 1 nm CsF / Al, and ITO / 5 nm CuPc / 40 nm NPB / 20 nm 1:1 NPB:Alq3 / 30 nm Alq3 / 1 nm CsF / Al, respectively. As expected, the devices exhibited a positive (EL-enhancing) spin 1/2 resonance at T = 20 K and a negative (ELquenching) spin 1/2 resonance at room temperature. It was found that the positive and negative resonance was stronger in the abrupt junction and in the mixed layer devices, respectively. The results are discussed in relation to the mechanisms responsible for these resonances, namely reduced quenching of singlet excitons by polarons and triplet excitons, and enhanced quenching by trions, respectively.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emily Hellerich, Ying Chen, Min Cai, and Joseph Shinar "Electroluminescence-detected magnetic resonance study of OLEDs containing a mixed N,N'-diphenyl-N,N'-bis(1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPB)/tris(quinolinolate) Al (Alq3) layer", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 741522 (27 August 2009); https://doi.org/10.1117/12.828559
PROCEEDINGS
7 PAGES


SHARE
Advertisement
Advertisement
Back to Top