Origin of the red luminescence band in photoluminescence spectra of ZnSe nanowires

2007 ◽  
Vol 90 (6) ◽  
pp. 063103 ◽  
Author(s):  
U. Philipose ◽  
S. Yang ◽  
T. Xu ◽  
Harry E. Ruda
Keyword(s):  
Luminescence Band ◽  
Photoluminescence Spectra ◽  
Znse Nanowires ◽  
Red Luminescence

EXCITONIC PHOTOLUMINESCENCE IN PENTACENE SINGLE CRYSTAL

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3753-3756 ◽  
Author(s):  
T. AOKI-MATSUMOTO ◽  
K. FURUTA ◽  
T. YAMADA ◽  
H. MORIYA ◽  
K. MIZUNO ◽  
...  
Keyword(s):  
Absorption Band ◽  
Single Crystals ◽  
Lower Energy ◽  
Luminescence Band ◽  
Laser Light ◽  
Stokes Shift ◽  
Photoluminescence Spectra ◽  
Exciton Luminescence ◽  
Exciton Absorption ◽  
Exciton Absorption Band

Photoluminescence of pentacene single crystals is studied in the temperature range of 7 K to 200 K under excitation with He-Ne laser light. Photoluminescence spectra consist of four broad bands, L1 to L4. The highest energy band, L1, located close to the lowest exciton absorption band mainly appears for //b-polarization. The intensity of the second one, L2, with Stokes-shift of about 1500 cm -1, decreases as temperature rises above 30 K and disappears at 100 K. The bands, L3 and L4, which are located at lower energy, are observed at higher temperatures up to 200 K. Based on their energy positions, the band L2 is assigned to a shallow self-trapped exciton luminescence band, and the bands L3 and L4 to deep self-trapped exciton luminescence bands. By comparing this result with reported result on tetracene crystals, self-trapped excitons are considered to be more stable in pentacene.

scholarly journals Effect of impurities and disordering on the photoluminescence of crystals and glasses in the system Li2O - 7GeO2

2019 ◽  
Vol 27 (1) ◽  
pp. 51-56
Author(s):  
O. V. Ohiienko ◽  
V. N. Moiseienko ◽  
M. D. Volnyanskij
Keyword(s):  
Luminescence Band ◽  
Material Structure ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Broad Luminescence Band ◽  
Intense Luminescence ◽  
Doped Glasses ◽  
Effect Of Impurities ◽  
Oxygen Complexes ◽  
Octahedral Configuration

The work is devoted to the study of photoluminescence spectra of weakly polar ferroelectric crystals Li2Ge7O15 and Li2O – 7GeO2 glasses. For all initial samples was observed the wide intensive luminescence band with maximum in the region of 525–550 nm. The spectral distribution of intensity and the position of the maximum of the band for a Li2Ge7O15 crystal depended on the excitation wavelength (λex=405 nm or 365nm were used). The spectral profile of the luminescence band was broadened in glass containing of 0.67% copper. The intensity of the luminescence band was decreased 6 times for glass doped with Cr3+ ions (0.01%) as compared with glass containing Cu2+ ions. The intense luminescence band of Cr3+ ions with λmax=659nm was appeared starting from 600. The assumption about the nature of the broad luminescence band observed in both nominally pure and doped glasses and crystals was made: the source of luminescence can be germanium - oxygen complexes [GeO4] and [GeO6] of the tetrahedral and octahedral configuration in the material structure.

scholarly journals DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band

2012 ◽  
Vol 111 (5) ◽  
pp. 054311 ◽  
Author(s):  
P. R. Coxon ◽  
M. Newman ◽  
M. R. C. Hunt ◽  
N. O’Farrell ◽  
B. R. Horrocks ◽  
...  
Keyword(s):  
Silicon Nanocrystals ◽  
Luminescence Band ◽  
X Ray ◽  
Infra Red ◽  
Red Luminescence ◽  
X Ray Absorption

Red-luminescence band: A tool for the quality assessment of germanium and silicon nanocrystals

2017 ◽  
Vol 419 ◽  
pp. 476-483 ◽  
Author(s):  
I. Fraj ◽  
L. Favre ◽  
T. David ◽  
M. Abbarchi ◽  
K. Liu ◽  
...  
Keyword(s):  
Quality Assessment ◽  
Silicon Nanocrystals ◽  
Luminescence Band ◽  
Red Luminescence

Photoluminescence of LiF Crystals Doped with Oxygen-Containing Impurities

2018 ◽  
Vol 769 ◽  
pp. 141-145 ◽  
Author(s):  
Vladimir I. Korepanov ◽  
Pavel V. Petikar ◽  
Guang Hui Ge ◽  
Anna A. Lipovka
Keyword(s):  
Luminescence Band ◽  
Emission Spectra ◽  
Photoluminescence Excitation ◽  
Photoluminescence Spectra ◽  
Excitation Spectra ◽  
Absorption Bands ◽  
Absorption And Emission ◽  
Oxygen Ions ◽  
Luminescence Centers ◽  
Oxygen Center

The aim of this paper is to study the photoluminescence spectra and photoluminescence excitation spectra in LiF-O, LiF-WO3and LiF-TiO2crystals at 20-300 K. It is shown that the luminescence centers in LiF-WO3and LiF-TiO2crystals are oxygen ions O2-disturbed by defects. Two absorption bands within 6-4.5 eV and two luminescence bands with maxima at 3.1 eV and 2.64 eV correspond to these centers. The absorption and emission spectra of the oxygen center (3.1 eV luminescence band) are close to those for the (O2-- Va) center.

Twinning effect on photoluminescence spectra of ZnSe nanowires

2014 ◽  
Vol 116 (17) ◽  
pp. 174303 ◽  
Author(s):  
Jing Xu ◽  
Chunrui Wang ◽  
Binhe Wu ◽  
Xiaofeng Xu ◽  
Xiaoshuang Chen ◽  
...  
Keyword(s):  
Photoluminescence Spectra ◽  
Znse Nanowires

scholarly journals Substrate-Dependent Differences in the Crystal Structures and Optical Properties of ZnSe Nanowires

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Keumyoung Seo ◽  
Jihye Bong ◽  
Jae-Woo Kim ◽  
Yoon-Ho Song ◽  
Yong Ho Shin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Structural Properties ◽  
Field Emission ◽  
Hexagonal Structure ◽  
Emission Peak ◽  
Photoluminescence Spectra ◽  
Red Emission ◽  
Light Emitting ◽  
Znse Nanowires ◽  
Emission Light

The optical and structural properties of ZnSe nanowires directly grown on three different substrates, SiO2, ITO, and graphene, were investigated. ZnSe nanowires grown on graphene and SiO2were found to have cubic structures, while ZnSe nanowires grown on ITO had a mixed cubic and hexagonal structure. The main peaks in the photoluminescence spectra of ZnSe nanowires grown on SiO2, ITO, and graphene were located at 459, 627, and 627/460 nm, respectively. In addition, a field-emission light-emitting device was fabricated using ZnSe nanowires as a phosphor and graphene as an electrode. The device showed a red emission peak with Commission Internationale de L’Eclairage coordinates of (0.621, 0.315).

scholarly journals Fine structure of the red luminescence band in undoped GaN

2014 ◽  
Vol 104 (3) ◽  
pp. 032103 ◽  
Author(s):  
M. A. Reshchikov ◽  
A. Usikov ◽  
H. Helava ◽  
Yu. Makarov
Keyword(s):  
Fine Structure ◽  
Luminescence Band ◽  
Red Luminescence

scholarly journals Nature of red luminescence band in research-grade ZnO single crystals: A “self-activated” configurational transition

2014 ◽  
Vol 105 (4) ◽  
pp. 041912 ◽  
Author(s):  
Y. N. Chen ◽  
S. J. Xu ◽  
C. C. Zheng ◽  
J. Q. Ning ◽  
F. C. C. Ling ◽  
...  
Keyword(s):  
Single Crystals ◽  
Luminescence Band ◽  
Research Grade ◽  
Red Luminescence
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