Exciton Phosphorescence of p-Terphenyl Crystal at 300 K

1980 ◽  
Vol 35 (8) ◽  
pp. 823-827 ◽  
Author(s):  
Eizi Morikawa ◽  
Masahiro Kotani
Keyword(s):  
Energy Transfer ◽  
Absorption Coefficient ◽  
Phosphorescence Spectrum ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Diffusion Limited ◽  
Exciton Lifetime ◽  
Glassy Solution ◽  
Vibrational Progression ◽  
Triplet Energy Transfer

Abstract Exciton phosphorescence from pure p-terphenyl crystals was observed at 300 K. The 0-0 band of the phosphorescence spectrum was found at 20.4 X 103 cm-1 . The vibrational progression of 1.46 x 103 cm-1 is present. The maximum exciton lifetime observed was 200 ms. The excitation spectrum of the exciton phosphorescence differs considerably from that observed in glassy solution, but is poorly structured as well. The absorption coefficient near the origin is small. The absence of sensitized delayed fluorescence from doped tetracene suggests that the triplet energy transfer to this guest is not diffusion limited.

P-Typ-verzögerte Fluoreszenz von 1-Naphthyl-9-carbazyl-methan

1986 ◽  
Vol 41 (7) ◽  
pp. 971-973
Author(s):  
Maximilian Zander
Keyword(s):  
Energy Transfer ◽  
Filter Paper ◽  
Light Absorption ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Experimental Findings ◽  
Triplet Energy Transfer ◽  
Step Mechanism ◽  
Triplet Triplet Annihilation

P-tvpe Delayed Fluorescence o f 1-Naphthyl-9-carbazyl-methane At 77 K 1-naphthyl-9-carbazyl-methane adsorbed on filter paper shows predominantly delayed fluorescence o f the carbazole chromophore. The experimental findings are in agreement with the assumption that the carbazole chromophore after excitation by light absorption becomes first deactivated by intramolecular triplet-triplet energy transfer and then re-excited in a two-step mechanism including intermolecular naphthalene triplet-triplet annihilation and intramolecular singlet-singlet energy transfer from the naphthalene to the carbazole chromophore.

Achieving high power efficiency and low roll-off OLEDs based on energy transfer from thermally activated delayed excitons to fluorescent dopants

2015 ◽  
Vol 51 (60) ◽  
pp. 11972-11975 ◽  
Author(s):  
Shipan Wang ◽  
Yuewei Zhang ◽  
Weiping Chen ◽  
Jinbei Wei ◽  
Yu Liu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Power Efficiency ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
External Power ◽  
Triplet Energy Transfer

A high-efficiency fluorescent organic light-emitting device with a maximum external power efficiency (PE) of 53.4 lm W−1 was fabricated through efficient triplet energy transfer from a thermally activated delayed fluorescence (TADF) host to conventional fluorescent dopants.

Luminescence and triplet energy transfer in mixed crystals. I. Two-component systems

1969 ◽  
Vol 22 (10) ◽  
pp. 2061 ◽  
Author(s):  
KR Adam ◽  
MF O'Dwyer
Keyword(s):  
Energy Transfer ◽  
Delayed Fluorescence ◽  
Mixed Crystals ◽  
Temperature Dependent ◽  
Triplet Energy ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Quantitative Results ◽  
Triplet Energy Transfer

Quantitative results are given for the temperature dependence of the intensities and decays of phosphorescence and delayed fluorescence in a number of two-component organic mixed crystals. These results are interpreted in terms of a kinetic model. For low guest concentrations, the guest phosphorescence decay is found to be first order and strongly temperature dependent with an activation energy different from that involved in energy transfer to the host triplet exciton level.

Production and Annihilation of Triplet Excitons in Organic Materials near Absorbing Surfaces

1971 ◽  
Vol 26 (5) ◽  
pp. 799-802
Author(s):  
H. Kallmann
Keyword(s):  
Energy Transfer ◽  
Exciting Radiation ◽  
Delayed Fluorescence ◽  
Transfer Energy ◽  
Triplet Energy ◽  
Order Of Magnitude ◽  
Absorbing Layer ◽  
Hole Current ◽  
Triplet Energy Transfer ◽  
Triplet Excitons

The theory of delayed fluorescence produced in an organic material by singlet excitation through an absorbing layer is given. It is shown, that it will be reduced by a factor la2/(la +ls)2 due to the singlet energy transfer to such a layer, where U the penetration depth of the exciting irradiation and I3 the diffusion lenght of the singlets. Further reduction of delayed fluorescence should be observed, when also triplet excitons transfer energy to the absorbing layer. Assuming this triplet transfer probability to be of the same order of magnitude as that for triplet energy transfer between neighbouring molecules, it should lead to quenching of delayed fluorescence proportional to la2/lt2 .The exponential portion of the decay of delayed fluorescence should become faster only if triplet energy transfer to the layer takes place. Further, the triplet induced hole-current produced at an absorbing electrode under singlet excitation should display a dependence on the wavelength of the exciting radiation as la(la + ls). Its maximum should not occur at the wavelength of strongest absorption but at much larger penetration depths of the exciting radiation.

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