Chapter - 9 Energy Transfer Processes

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Presentation transcript:

Chapter - 9 Energy Transfer Processes 1. Intermolecular (or atomic) energy transfer 1. Forster energy transfer 2. Dexter energy transfer 2. Intramolecular (or atomic) energy transfer Advantages of Doped Emitter (H-G System): Improved EL Efficiency Color tuning Improved EL Stability

Applications Aluminate Blue Phosphors for Fluorescent Lamps Europium Activated Barium Magnesium Aluminate (BaEu)MgAl10O17 2) Aluminate Green Phosphors for Fluorescent Lamps Cerium and Terbium Activated Magnesium Aluminate (Ce,Tb)MgAl11O19 3) Red Phosphors for Fluorescent Lamps Europium Activated Yttrium Oxide Y2O3:Eu Red : Guest, Black : Host

bound electron-hole pairs An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force.

Dexter, D.L. 1953. J. Chem. Phys. 21:836 Förster, Th., 1948. Ann. Phys. 2:55

EE Electron Exchange

CI Coulombic Interaction

Derivation (Not for Examination) The energy transfer from Donor to Acceptor molecules can be denoted as D* + A  D + A* Initial state (Before Energy Transfer) ψi = 1/ √2 [ψD*(1) ψA(2) - ψD*(2) ψA(1)]. Final State ( After Energy Transfer ) ψf = 1/ √2 [ψD(1) ψA*(2) - ψD(2) ψA*(1)].

Rate of Energy Transfer (Not for Examination)

Forster Energy Transfer Rate (Not for Examination)

Förster distance (R0, nm) Förster distances of different donor-acceptor pairs. Donor Acceptor Förster distance (R0, nm) Naphthalene Dansyl 2.2 LY TNP-ATP 3.5 ODR 4.3 EM 5.3 FITC 6.0 BPE CY5 7.2 Abbreviations: BPE, B-phycoerythrin; CY5, carboxymethylindocyanine; Dansyl, just dansyl group; EM, eosin maleimide; FITC, fluorscein-5-isothiocyanate; LY, Lucifer yellow;ODR, octadecylrhodamine; TNP-ATP, trinitrophenyl-ATP.

Donor Acceptor Ro(Ǻ) Fluorescein Tetramethlrhodamine 55 IAEDANS 46 Typical values of R0 Donor Acceptor Ro(Ǻ) Fluorescein Tetramethlrhodamine 55 IAEDANS 46 EDANS Dabcyl 33 Fluoresscein 44 BODIPY FL 57 Qsy7&Qsy9 dyes 61

Dexter Energy Transfer Rate (Not for Examination)

Doped Emitters