1 ultrafast energy transfer in oligofluorene-aluminum bis(8-hydroxyquinoline)acetylacetone...
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Ultrafast Energy Transfer in Oligofluorene-AluminumBis(8-hydroxyquinoline)acetylacetone Coordination Polymers
Victor A. Montes, Grigory V. Zyryanov, Evgeny Danilov, NeerajAgarwal, Manuel A. Palacios, and Pavel Anzenbacher Jr.*
J. Am. Chem. Soc., 2009, 131 (5), 1787-1795
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Outline Introduction Resonance energy transfer Organic light-emitting diode
Experiment Synthesis Optical properties Ultrafast energy migration Solid-state electroluminescence
Conclusions
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Resonance Energy Transfer (RET)
http://micro.magnet.fsu.edu/primer/techniques/fluorescence/fret/fretintro.html
T. Förster in 1959 proposed the Förster theory of resonance energy transfer
S*+Q → S+Q*
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Resonance Energy Transfer (RET)
Energy transfer is efficient when: 1.The energy donor and acceptor are separated by a
short distance.(30~100 Å)
2.Photons emitted by the excited state of the donor can
be absorbed directly by the acceptor.
Emission spectra of Donor
Absorption spectra of acceptor
Overlaps
Et: efficiency of energy transferR0: Förster distance
r : distance between donor and acceptor
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Principle of OLED Device Operation
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OLED v.s LCD
萬能科技大學光電系張興華 OLED 投影片
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Device structures
Electroluminescence Layer
萬能科技大學光電系張興華 OLED 投影片
Cathode : CsF:Al
Hole Injection Layer : PEDOT:PSS
Anode : Indium-tin-oxide
Electroluminescence Layer
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OLED v.s PLED
萬能科技大學光電系張興華 OLED 投影片
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Structure of Alq3-type complexes
Montes, V. A; Pohl, R.; Shinar, J.; Anzenbacher, P., Jr. Chem.-Eur. J. 2006, 12, 4523.
Complex 2
Red-shift
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Electroluminescence Spectra of Alq3-type Complexes
Montes, V. A; Pohl, R.; Shinar, J.; Anzenbacher, P., Jr. Chem.-Eur. J. 2006, 12, 4523.
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Oligofluorene :OF Alq2acac
Anzenbacher, P., Jr. Chem. Commun. 2007, 3708.
X.; Wang, Y.Appl. Phys. Lett. 2008, 92, 103305.
n
NN
OH
HO
Al N
O
N O
N
O
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Synthesis of Oligofluorene
Anzenbacher, P., Jr. Chem. Commun. 2007, 3708.
a) Pd(PPh3)4, Et4N+OH- in MeOH, toluene, 60°C
b) 1,4-cyclohexadiene, Pd-C (10%), isopropanol, reflux.
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1H NMR spectra of Oligofluorene
Figure 1. 1H NMR spectra of the ditopic ligands. Residual CHCl3 signals are marked with an asterisk.
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Synthesis of Alq2(acac) and 1a-e
Scheme 1. Synthesis of Alq2(acac) and Coordination Polymers 1a-e Using Tris(acetylacetonate)aluminum(III), and X-ray Structure of Alq2(acac)
n
5 days
Yield=76% ~ 98%
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UV-vis absorption spectra of 1a-e
Figure 2. UV-vis absorption spectra of 1a-e in a CH2Cl2 solution showing contribution of both oligofluorene (OF) and AlIII quinolinolate chromophores.
Table 1. Summarized Absorption Data for Bichromophoric Systems 1a-e
340 nm 475 nm
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Emission spectra of 1a-e
Figure 3. Corrected emission spectra of the coordination polymers 1a-e in CH2Cl2 upon excitation at 340 nm
550 nm
410 nm
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Excitation spectra of 1a-e
Figure 4. Excitation spectra of the polymers when monitored at 550 nm.
UV-vis absorption spectra of 1a-e
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Transient Absorption Spectra
清華大學化學研究所 2005 陳學穎碩士論文
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TMSTMS
3
Model 3
Al N
O
N O
N
O
Model 2
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Model compound 2
Figure 5. (A) Absorption and emission spectra of model compound 2. (C) Transient absorption spectra of 2 0.2 ps after pump pulse at 475 nm and its decay monitored at 750 nm (inset).
excitation at 475 nm ( - * of Alq3)
τ=9200 ps
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Model compound 3
Figure 5.(B) Absorption and emission spectra of model compound 3. (D) Transient absorption spectra of 3 0.2 ps after pump pulse at 340 nm and its decay monitored at 750 nm(inset).
excitation at 340 nm ( - * of oligofluorene )
τ=642 ps
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Transient absorption spectra of 1a-e
0.2 ps after excitation at 475 nm( - * of Alq3)
520 nm 640 nm
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Transient absorption spectra of 1a-e
0.2 ps after excitation at 340 nm( - * of oligofluorene )
475 nm
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Transient absorption spectra for 1d
Figure 6. Left : Transient absorption spectra for 1d after excitation at 340 nm (0.5mW) at various times . Right : Exponential fit of the kinetic profile at 750 nm.
τ=1.4 ps
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Rate Constants for Energy Transfer
kET = Obs-1 - Fl
-1
Table 2. Calculated Rate Constants for Energy Transfer in the Coordination Polymers 1c-e Monitored by Decay at 750 nm
kET is the overall rate of energy transfer
Obs is the lifetime observed for the spectral change in the transient experiment
Fl represents the fluorescence lifetime
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Mechanism for Intramolecular Energy Transfer
kET = keh+kfq
1e
keh = exciton hopping between the fluorene moieties kfq = strongly exothermic transfer from fluorene to AlIII quinolinolate
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Mechanism for Intramolecular Energy Transfer
Figure 7. Schematic representation of the mechanism for intramolecular energy transfer as proposed for the behavior of the bichromophoric systems 1c-e.Only one pathway of energy migration is shown for simplicity purposes.
1c
1d
1e
kET=6.9x1011 (s-1)
kET=7.1x1011 (s-1)
kET=3.3x1011 (s-1)
kET=keh+kfq
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Simplified OLED architectures
Cathode : CsF (10 Å) : Al (1200 Å)
Hole Injection Layer : PEDOT:PSS (500 Å)
Anode : Indium-tin-oxide
Electroluminescence Layer : 1a-c (600 Å)
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1a-OLED
Figure 8. Left: Electroluminescence spectra of 1a-OLED at a voltage of 9 V. The inset shows a photograph of the operating device. Right: I-V and luminance curves of the ITO/PEDOT:PSS/1a /CsF:Al OLED.
external quantum efficiency of 1.2%.
maximum luminance was 6000 cd/m2
turn-on voltage of 6 V∼
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Conclusions
Novel coordination polymers comprising oligofluorene moieties of a varying size (n = 1-9) connected via aluminum(III) bis(8-quinolinolate)acetylacetone (Alq2(acac)) complexes were synthesized and their photophysical properties were studied.
The energy migration from oligofluorene to the quinolinolate moieties was observed proceeding at a rate order of 1011 s-1.
In the solid state, complete energy transfer from oligofluorene fragments to the quinolinolate centers was observed due to intermolecular energy transfer.