讲稿20. 有机发光二极管-第八部分
31页1、1,Organic LEDs part 8,Exciton Dynamics in Disordered Organic Thin Films Quantum Dot LEDs,Handout on QD-LEDs: Coe et al., Nature 420, 800 (2002).,April 29, 2003 Organic Optoelectronics - Lecture 20b,2,Exciton Dynamics in Time Dependant PL,3,Dynamic Spectral Shifts of DCM2 in Alq3, Measurement performed on doped DCM2:Alq3 films Excitation at =490 nm (only DCM2 absorbs), DCM2 PL red shifts 20 nm over 6 ns ,Wavelength nm ,4,Time Evolution of 4% DCM2 in Alq3 PL Spectrum,5,Electronic Processes in Mole
2、cules,density of available S1 or T1 states,6,Time Evolution of DCM2 Solution PL Spectra,7,Spectral Shift due to, Exciton Diffusion Intermolecular Solid State Interactions ,8,Excitonic Energy Variations,9,Exciton Distribution in the Excited State (S1 or T1), Time Evolved Exciton Thermalization ,EXCITON DIFFUSION LEADS TO REDUCTION IN FWHM,10,11,12,13,Time Evolution of Peak PL in Neat Thin Films,14,Parameters for Simulating Exciton Diffusion,observed radiative lifetime (),Normalized Integrated Spe
3、ctral Intensity,Frster radius (RF), Assign value for allowed transfers:, Assume Gaussian shape of width, wDOS Center at peak of initial bulk PL spectrum Molecular PL spectrum implied,excitonic density of states (gex(E),15,Fitting Simulation to Experiment Doped Films, Good fits possible for all data sets RF decreases with increasing doping, falling from 52 to 22 wDOS also decreases with increasing doping, ranging from 0.146 eV to 0.120 eV,16,Fitting Simulation Neat Films, Spectral shift observed
4、in each material system Molecular dipole and wDOS are correllated: lower dipoles correspond to less dispersion Even with no dipole, some dispersion exists Experimental technique general, and yields first measurements of excitonic energy dispersion in amorphous organic solids,17,Temporal Solid State Solvation,upon excitation both magnitude and direction of lumophore dipole moment can change FOR EXAMPLE for DCM: 1 0 20 Debye ! from 5.6 D to 26.3 D ,following the excitation the environment surround
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