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

Emily Hellerich; Ying Chen; Min Cai; Joseph Shinar

doi:10.1117/12.828559

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

Emily Hellerich, Ying Chen, Min Cai, Joseph Shinar

Author Affiliations +

Proceedings Volume 7415, Organic Light Emitting Materials and Devices XIII; 741522 (2009) https://doi.org/10.1117/12.828559
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

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.

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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

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KEYWORDS

Organic light emitting diodes

Polarons

Aluminum

Magnetism

Electroluminescence

Selenium

Tellurium

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