scholarly journals Free and self-trapped exciton emission in perovskite CsPbBr3 microcrystals

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 1035-1042
Author(s):  
Fang Pan ◽  
Jinrui Li ◽  
Xiaoman Ma ◽  
Yang Nie ◽  
Beichen Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Emission Band ◽  
Exciton Emission ◽  
Cvd Method

A broad STE emission band together with a FE emission was found at low temperature in a CsPbBr3 microcrystal sample prepared by CVD method.

Anthracene fluorescence at low temperatures. I. Purified single crystals

1972 ◽  
Vol 25 (7) ◽  
pp. 1411 ◽  
Author(s):  
LE Lyons ◽  
LJ Warren
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
Fluorescence Spectrum ◽  
Low Temperatures ◽  
Free Exciton ◽  
Deformation Bands ◽  
Exciton Emission ◽  
Polarized Emission ◽  
Impurity Bands ◽  
Phonon Structure

The low-temperature fluorescence spectrum of purified vapour-grown anthracene single crystals is presented and the free-exciton emission distinguished from a number of defect or impurity bands present even in the purest crystals. In assigning the observed bands the symmetry of the active vibrations and the origin of background fluorescence and deformation bands are discussed. The phonon structure in the region of the fluorescence origin was found to be almost completely b-polarized. Emission of electronic origin (25103 cm-1) was too weak to be observed. Polarization ratios of the principal vibronio bands at 5.6 K are given.

Properties and Production Mechanism of Low-Temperature Deposited CAT-CVD Poly-Silicon films

1992 ◽  
Vol 283 ◽  
Author(s):  
Hideki Matsumura ◽  
Yoichi Hosoda ◽  
Seijiro Furukawa
Keyword(s):  
Chemical Vapor Deposition ◽  
Low Temperature ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Gas Pressure ◽  
Silicon Films ◽  
Production Mechanism ◽  
Cvd Method ◽  
Poly Silicon ◽  
Deposition Conditions

ABSTRACTPoly-silicon films are obtained at temperatures as low as 400 °C by the catalytic chemical vapor deposition (cat-CVD) method, in which deposition gases are decomposed by the catalytic or pyrolytic reactions with a heated catalyzer near substrates. It is found that there are roughly two modes of deposition conditions such as low gas pressure mode and high gas pressure mode for obtaining poly-silicon films, and also that the Hall mobility of the cat-CVD poly-silicon films of low gas pressure mode sometimes exceeds over 100 cm2/Vs.

Low-temperature synthesis of BiSrCaCuO films by photo CVD method

1991 ◽  
Vol 190 (1-2) ◽  
pp. 143-144
Author(s):  
Masaaki Nakabayashi ◽  
Tadashi Shiraishi ◽  
Takuya Hashimoto ◽  
Khaliq A. Chaudhary ◽  
Hideomi Koinuma
Keyword(s):  
Low Temperature ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Cvd Method

STUDY OF NANOSTRUCTURES OF ZINC OXIDE SYNTHESIZED BY LOW-TEMPERATURE HYDROTHERMAL METHOD

2018 ◽  
Vol 20 (4) ◽  
pp. 209-217
Author(s):  
S.S. Kurbanov ◽  
Sh.Z. Urolov ◽  
Z.Sh. Shaymardanov ◽  
R.R. Jalolov
Keyword(s):  
Low Temperature ◽  
Hydrothermal Method ◽  
Emission Band ◽  
Free Exciton ◽  
Zno Nanorods ◽  
Growth Direction ◽  
Orange Emission ◽  
Yellow Orange ◽  
Violet Band ◽  
Vertically Aligned

Room temperature photoluminescence (PL) properties of vertically aligned and spindle-shaped, randomly oriented ZnO nanorods synthesized by using a low temperature hydrothermal method are studied. In air, the vertically aligned ZnO nanorods oriented mainly parallel to the luminescencerecording axis exhibited only one, very strong UV emission peak at 382 nm. This band is assigned to emission of free excitons. A new violet PL band near 400 nm arises with increasing angle between the nanorod growth direction and the luminescence-recording axis. The violet band also appears under UV illumination in vacuum and vanishes after exposure to air. The randomly oriented ZnO nanorods along with free exciton related PL band reveal a broad yellow-orange emission band around 590 nm. The violet band is attributed to Zn vacancy related defects or their complexes, while the yellow-orange emission band is ascribed to oxygen interstitial related defects.

A new bound-exciton emission band in ZnSe crystals and multiplasmon optical transitions

1999 ◽  
Vol 41 (7) ◽  
pp. 1070-1074
Author(s):  
V. S. Vavilov ◽  
M. V. Chukichev ◽  
R. R. Rezvanov ◽  
A. A. Klyukanov ◽  
K. D. Sushkevich ◽  
...  
Keyword(s):  
Emission Band ◽  
Optical Transitions ◽  
Exciton Emission

A Low-temperature Emission Band from Dilute Solutions of Pure Chlorophyll a

Nature ◽  
1963 ◽  
Vol 199 (4898) ◽  
pp. 1097-1098 ◽  
Author(s):  
SEYMOUR STEVEN BRODY ◽  
S. B. BROYDE
Keyword(s):  
Low Temperature ◽  
Chlorophyll A ◽  
Emission Band ◽  
Dilute Solutions

Batch processing of high-performance a-Si/SiN TFTs using a low-temperature hot-wall CVD method

1993 ◽  
Vol 1 (2) ◽  
pp. 181
Author(s):  
Byung-chul Ahn ◽  
Hiroshi Kanoh ◽  
Osamu Sugiura ◽  
Masakiyo Matsumura
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Batch Processing ◽  
Cvd Method

Low temperature synthesis of CsPbI 3 sub-micrometer wires with tailored emission band for flexible X-ray phosphors applications

2017 ◽  
Vol 188 ◽  
pp. 454-459 ◽  
Author(s):  
Junqian Zhao ◽  
Huaina Yu ◽  
Shusheng Pan ◽  
Shang Zhou ◽  
Li Zhong ◽  
...  
Keyword(s):  
Low Temperature ◽  
Emission Band ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
X Ray

Color Centers in Magnesium Doped Polycrystalline Alumina

2001 ◽  
Vol 667 ◽  
Author(s):  
L. R. Brock ◽  
K. C. Mishra ◽  
Madis Raukas ◽  
Walter P. Lapatovich ◽  
George C. Wei
Keyword(s):  
Low Temperature ◽  
Emission Band ◽  
Emission Spectroscopy ◽  
Color Centers ◽  
Absorption Bands ◽  
Fluorescence Excitation ◽  
Polycrystalline Alumina ◽  
Zero Phonon Line ◽  
Related Defect ◽  
Single Crystal Sapphire

ABSTRACTWe have investigated color centers in MgO-doped polycrystalline alumina (PCA) using absorption, excitation, and emission spectroscopy. Most of the color centers that were reported in earlier studies of the crystalline material have been observed to be present in the polycrystalline material. The absorption spectral features observed in the PCA are attributed to various color centers; however, they are not sufficiently resolved to make unique assignments. Suitable combinations of excitation and emission spectroscopy and also measurements at low temperature were therefore used to identify most of the color centers in this material.Among the numerous color centers that we have identified in PCA are variations of electron centers including F, F+, F2+, F22+ and F+-Mg ((Vo•-MgAl')x). The most prominent oxygen vacancy related defect observed at room temperature was the F+-Mg center, with absorption bands located at 217 and 249 nm, and an emission band at 303 nm. This center can be thought of as being formed by association of an F+ center with a Mg defect. The single crystal sapphire samples containing no Mg show only F+ (Vo•) centers with 230 and 257 nm absorption bands, and a 328 nm emission band.Low temperature (22 K) fluorescence excitation measurements of PCA led to emission from F22+center at 467 nm. Additionally, there is evidence that the observed 368 nm emission band could be attributed to the zero-phonon line associated with the F2+center.

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