Utilisation des nanoparticules pour l’amélioration des performances des sources organiques (OLED)

AYENEW Getachew

Direction de thèse: Alexis Fischer et Azzedine Boudrioua, Encadrement : Mah moud Chakaroun, Nathalie Fabre

Assistance technologique: Jeanne Solard

23/03/2011

Major tasks:

• Simulation (FDTD)– Practice the FTDT method (Fullwave of Rsoft)

• Experiment – OLEDs and Nanoparticlesfor light extraction ( samples from Taiwan )

• Poster

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Simulation:

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Structure to be simulated: monolayer/multilayer of nanoparticlesMethod: 3D FTDT

• Detect the signal,• Transmision and reflection spectras

( Fourier transform)

Excitation Monitor

Objective :Study the response of photonic structure for excitations in different directions

Simulation• 2D dielectric cylinder in Air:

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ncylinder = 3.4 nbackground(air)=1

Simulation type: 2D FDTD 2D PWE

• TE PWE

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TE Polarization

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No complete disappearance of detected signal, compared to TE case good agreement with Band diagram (PWE)

TM Polarization

Nanoparticles and OLEDs : light extraction

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Samples with Nanoparticle : Nanoparticle deposition made in Taiwan Size of nanoparticles: 1.3µm

Référencé Samples: prepared in clean room

Characterization : • Emission spectra ( intensity vs wavlength)• IVL characteristic

OLED structure: Glass/ITO/CUPC/TPD/AlQ 3/Al

Result to be analysed

Perspective• 3D FDTD simulation for monolayer/multilayer

of nanoparticles• Nanoparticles and OLEDs (light extraction)

Optical characterization

• Self assembly of nano particles

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Thank you

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