Delayed Fluorescence and Phosphorescence from Polyphenylquinoxalines

2002 ◽  
Vol 106 (46) ◽  
pp. 11045-11053 ◽  
Author(s):  
A. Hayer ◽  
Bässler ◽  
B. Falk ◽  
S. Schrader
Keyword(s):  
Delayed Fluorescence ◽  
Fluorescence And Phosphorescence

Stimuli responsive and reversible crystalline–amorphous transformation in a molecular solid: fluorescence switching and enhanced phosphorescence in the amorphous state

2019 ◽  
Vol 7 (23) ◽  
pp. 7083-7089 ◽  
Author(s):  
Pagidi Sudhakar ◽  
T. P. Radhakrishnan
Keyword(s):  
Amorphous State ◽  
Delayed Fluorescence ◽  
Sharp Contrast ◽  
Stimuli Responsive ◽  
Fluorescence Switching ◽  
Solid Fluorescence ◽  
External Stimuli ◽  
Fluorescence And Phosphorescence ◽  
Molecular Solid

A diaminodicyanoquinodimethane molecule based material undergoes reversible crystalline–amorphous transformation upon external stimuli. Significantly, delayed fluorescence and phosphorescence are observed in the material, with an unusual enhancement of the latter in the amorphous state, in sharp contrast to the decrease in fluorescence.

scholarly journals Lumineszenzuntersuchungen am kristallinen Phenanthren

1967 ◽  
Vol 22 (1) ◽  
pp. 112-118
Author(s):  
A. Tschampa
Keyword(s):  
Energy Level ◽  
Uv Light ◽  
Delayed Fluorescence ◽  
Crystal Defects ◽  
Thermal Stimulation ◽  
Delayed Luminescence ◽  
Thermal Release ◽  
Luminescence Behavior ◽  
Fluorescence And Phosphorescence ◽  
Stimulation Of

Despite extreme purification the luminescence of polycrystalline phenanthrene is strongly influenced by remaining impurities. Besides fluorescence the samples show a delayed fluorescence and phosphorescence and the normal triplet phosphorescence of an unknown impurity. After intense excitation with uv light both components of the delayed luminescence can be observed for several minutes. Thermal stimulation of both fluorescence and phosphorescence is possible. To describe the observed luminescence behavior an energy level diagram is proposed with exciton traps below the singlet and triplet band of the crystal. The traps are due to crystal defects and photochemical products respectively. A part of the delayed fluorescence is based on triplet triplet annihilation and delayed phosphorescence on thermal release of trapped excitons.

Delayed Fluorescence and Phosphorescence of 8-Aza-d-Homogonane in the Gas and Condensed Phases

2006 ◽  
Vol 16 (5) ◽  
pp. 649-653 ◽  
Author(s):  
N. A. Borisevich ◽  
T. F. Raichyonok ◽  
A. A. Sukhodola ◽  
G. B. Tolstorozhev
Keyword(s):  
Delayed Fluorescence ◽  
Condensed Phases ◽  
Fluorescence And Phosphorescence
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