Total and Radiative Triplet-Triplet Exciton-Annihilation Rate Constant in Pyrene Crystals

1973 ◽  
Vol 8 (12) ◽  
pp. 6038-6042 ◽  
Author(s):  
V. Ern ◽  
H. Bouchriha ◽  
M. Bisceglia ◽  
S. Arnold ◽  
M. Schott
Keyword(s):  
Rate Constant ◽  
Triplet Exciton ◽  
Annihilation Rate ◽  
Exciton Annihilation

scholarly journals Temperature Dependence of the Exciton-Exciton Annihilation Rate Constant in Poly (Di-N-Hexylsilane)

1993 ◽  
Vol 328 ◽  
Author(s):  
R. G. Kepler ◽  
Z. G. Soos
Keyword(s):  
Energy Transfer ◽  
Rate Constant ◽  
Room Temperature ◽  
Polymer Chains ◽  
Annihilation Rate ◽  
Excited State Lifetime ◽  
Fluorescence Depolarization ◽  
Solid Films ◽  
Exciton Annihilation ◽  
Short Time

ABSTRACTFluorescence depolarization studies of polysilane chains in solution have shown that energy transfer along the polymer chains occurs for only a very short time relative to the excited state lifetime and only over short distances before the excited states become trapped in long, low-energy segments. However, in solid films we have shown in previous work that excitons are highly Mobile throughout their 600 ps lifetime at room temperature, presumably because energy transfer among neighboring, parallel chain segments becomes possible. In this paper we report that the exciton-exciton annihilation rate constant decreases by only a factor of five between room temperature and 12 K, showing that the excitons do not become trapped even at low temperatures.

Triplet-Triplet Upconversion in Organic Light- Emitting Diodes: Implications to Injection Lasing

2020 ◽  
Author(s):  
Atul Shukla ◽  
Monirul Hasan ◽  
Gangadhar Banappanavar ◽  
Viqar Ahmad ◽  
Jan Sobus ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Threshold Current ◽  
Triplet Exciton ◽  
Positive Contribution ◽  
Solid State Lasers ◽  
Light Emitting ◽  
Organic Solid ◽  
Exciton Annihilation ◽  
Fluorescence Material ◽  
Triplet Excitons

Abstract While significant progress has been made over last few years in the field of organic solid-state lasers, achieving lasing action from organic semiconductors under electrical excitation still remains a big challenge. One of the major barriers towards electrically pumped organic lasers are optical losses due to triplet excitons. In this work, we report both experimental and theoretical results that confirm positive contribution of triplet excitons for the scope of electrically driven organic laser. We studied a model fluorescence material, 9-(9-phenylcarbazole-3-yl)-10(naphthalene-1-yl) anthracene and reveals that the threshold current densities required to achieve lasing emission under electrical injection can be significantly reduced with the aid of triplet-triplet exciton upconversion processes. Furthermore, we demonstrate that, to achieve the best performance, the singlet-triplet exciton annihilation must be minimized. These results are unprecedented and provide a pathway towards development of new class of triplet-triplet upconversion materials for injection laser.

Triplet exciton annihilation in naphthalene at high triplet densities

1978 ◽  
Vol 18 (8) ◽  
pp. 4444-4453 ◽  
Author(s):  
L. Altwegg ◽  
Maria A. Davidovich ◽  
J. Fünfschilling ◽  
Iris Zschokke-Gränacher
Keyword(s):  
Triplet Exciton ◽  
Exciton Annihilation
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