Luminescence Tuning of MEH-PPV for Organic Electronic Applications
B.A. Paez-Sierraa and D.M. Marulanda b
aDepartamento de Física, Grupo de Docencia e Investigación en Física, Universidad Militar Nueva Granada, Carrera 11 No. 101-80; Carrera 30 No. 45-03, Bogotá, Colombia
bGrupo de Investigación REM-Research in Energy and Materials, Universidad Antonio Nariño, Bogotá, Colombia
Received: November 7, 2015
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In this report, a doped semiconducting ink consisting of a blended poly [2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) with aluminium-tris (8-hydroxychinolin) (Alq3) and diluted in toluene is formulated. The intentional doping with the electron transport nanoparticle Alq3 results in an additional band gap state of the hole transport MEH-PPV polymer and reduction of the switch on voltage of the organic LED display. Doping is probed at room temperature with photoluminescence spectroscopy. Photoluminescence results revealed that as the Alq3 content increases in blends, characteristic peaks of intensities of MEH-PPV are broadened and reduced. In addition, the emission for Alq3 concentrations between 30% and 60% are featured by a band at 565 nm (2.19 eV) for the lower concentration and consistently blue shifted to 530 nm (2.33 eV) for the higher concentration. This new band at 565 nm (2.19 eV) neither belongs to pure MEH-PPV nor to Alq3 and evidences charge transfer from the lowest unoccupied molecular orbital of the Alq3 to the highest occupied molecular orbital of the MEH-PPV.

DOI: 10.12693/APhysPolA.129.1187
PACS numbers: 72.80.Le, 78.55.Hx