Low-Temperature Emission Spectra of 9-Alkylanthracene Esters:Dimer Photodecomposition and Monomer Pair Interactions in Polymer Hosts

1994 ◽  
Vol 98 (40) ◽  
pp. 9986-9991 ◽  
Author(s):  
Kimberly Salt ◽  
Gary W. Scott
Keyword(s):  
Low Temperature ◽  
Emission Spectra ◽  
Monomer Pair ◽  
Pair Interactions

Low temperature emission spectra of optically nonlinear N-benzyl-2-methyl-4-nitroaniline crystal

2012 ◽  
Vol 404 ◽  
pp. 28-32 ◽  
Author(s):  
Katarzyna Piela ◽  
Bolesław Kozankiewicz ◽  
Józef Lipiński ◽  
M. Magdalena Szostak
Keyword(s):  
Low Temperature ◽  
Emission Spectra

Spectroanalytical Parameters of Fungal Metabolites. IV. Moniliformin

1974 ◽  
Vol 57 (6) ◽  
pp. 1392-1396 ◽  
Author(s):  
J A Lansden ◽  
R J Clarkson ◽  
W C Neely ◽  
R J Cole ◽  
J W Kirksey
Keyword(s):  
Low Temperature ◽  
Aqueous Solutions ◽  
Ambient Temperature ◽  
Emission Spectrum ◽  
Potassium Salt ◽  
Emission Spectra ◽  
Fungal Metabolites ◽  
Fungal Metabolite ◽  
Fluorescence Excitation ◽  
Phosphorescence Emission

Abstract The spectral data for a novel fungal metabolite, moniliformin (potassium salt of 1-hydroxycyclobut- 1-ene-3,4-dione), are reported. The corrected ambient temperature fluorescence excitation and emission spectra are given and the quantum efficiency is calculated to be 5.32 × 10舓3. The uncorrected low temperature phosphorescence emission spectrum and lifetime are also reported. Other physical data are given to support spectral evidence that the molecule exists as a dimer in aqueous solutions.

scholarly journals Study of Ultraviolet Emission Spectra in ZnO Thin Films

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Y. M. Lu ◽  
X. P. Li ◽  
P. J. Cao ◽  
S. C. Su ◽  
F. Jia ◽  
...  
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Free Exciton ◽  
Emission Spectra ◽  
Low Energy ◽  
Zno Thin Films ◽  
Ultraviolet Emission ◽  
Exciton Transition ◽  
Pl Spectra ◽  
Uv Emission

Photoluminescence (PL) of ZnO thin films prepared on c-Al2O3substrates by pulsed laser deposition (PLD) are investigated. For all samples, roomtemperature (RT) spectra show a strong band-edge ultraviolet (UV) emission with a pronounced low-energy band tail. The origin of this UV emission is analyzed by the temperature dependence of PL spectra. The result shows that the UV emission at RT contains different recombination processes. At low temperature donor-bound exciton (D0X) emission plays a major role in PL spectra, while the free exciton transition (FX) gradually dominates the spectrum with increasing temperatures. It notes that at low temperature an emission band (FA) appears in low energy side of D0X and FX and can survive up to RT. Further confirmation shows that the origin of the band FA can be attributed to the transitions of conduction band electrons to acceptors (e, A0), in which the acceptor binding energy is estimated to be approximately 121 meV. It is concluded that at room temperature UV emission originates from the corporate contributions of the free exciton and free electrons-to-acceptor transitions.

Simultaneous observation of low temperature 4f–4f and 3d–3d emission spectra in a series of Cr(III)(ox)Ln(III) assembly

2003 ◽  
Vol 101 (4) ◽  
pp. 307-315 ◽  
Author(s):  
Md.Abdus Subhan ◽  
Hiroyasu Nakata ◽  
Takayoshi Suzuki ◽  
Jong-Ha Choi ◽  
Sumio Kaizaki
Keyword(s):  
Low Temperature ◽  
Emission Spectra ◽  
Simultaneous Observation

Characterization of the Phenanthrene-Tetrachlorophthalic Anhydride (P/TCPA) 1:1 Charge-Transfer Crystal: Spectroscopic and Structural Investigations

1987 ◽  
Vol 42 (6) ◽  
pp. 622-629 ◽  
Author(s):  
J. Krzystek ◽  
J. U. von Schütz ◽  
H. C Wolf ◽  
R.-D. Stigler ◽  
J. J. Stezowski
Keyword(s):  
Charge Transfer ◽  
Low Temperature ◽  
Structural Model ◽  
Emission Spectra ◽  
Optical Emission ◽  
Delayed Fluorescence ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Structural Investigations ◽  
Space Group

The 1:1 phenanthrene-tetrachlorophthalic anhydride (P/TCPA) charge-transfer complex crystalizes with monoclinic symmetry, space group P21, with two magnetically inequivalent stacks in the unit cell. The noncentrosymmetric space group is very unusual for CT-complexes. The optical emission spectra at low temperature are characterized by a strong CT phosphorescence and a weak CT fluorescence and delayed fluorescence.The S1 band lies at 22 800 ± 100 cm-1, the T1 band at 21 200 ± 100 cm-1. Above 15 K triplet excitons, moving along the stacks are revealed by ESR. They have a CT character of about 30%, coinciding with that of the shallow X-traps found by ODMR at low temperatures. A further trap, with zero-field-splitting (zfs) parameters of D = ± 0.0617, E = + 0.0116 cm-1 has a much larger CT character of 50% as found in the isolated complex in low-temperature glass [1]. A structural model is proposed.

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