Comparative Investigation of Structural and Optical Properties of Si-Rich Oxide Films Fabricated by Magnetron Sputtering

2013 ◽  
Vol 854 ◽  
pp. 117-124 ◽  
Author(s):  
Larysa Khomenkova ◽  
M. Baran ◽  
Oleksandr Kolomys ◽  
Victor Strelchuk ◽  
Andrian V. Kuchuk ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Near Infrared ◽  
Light Emission ◽  
Argon Plasma ◽  
Annealing Treatment ◽  
Deposition Process ◽  
Peak Position ◽  
Comparative Investigation ◽  
Infrared Light ◽  
Pl Spectra

RF magnetron sputtering of two separate silicon and oxide (SiO2 or Al2O3) targets in pure argon plasma was used for deposition of Six(SiO2)1-x and Six(Al2O3)1-x films with x=0.15-0.7 on long fused quarts substrate. The effect of post-fabrication treatments on structural and light emitting properties of the films with different x values was investigated by means of Raman scattering, electron paramagnetic resonance and X-ray diffraction as well as by photoluminescence (PL) methods. The formation of amorphous Si clusters upon deposition process was found for the both types of films. The annealing treatment at 1150°C during 30 min results in formation of Si nanocrystallites (Si-ncs). The latter were found to be larger in Six(Al2O3)1-x films than that in Six(SiO2)1-x counterparts with the same x values and are under tensile stresses. The investigation of photoluminescence properties of annealed films of both types revealed the appearance of visible-near infrared light emission. The Six(SiO2)1-x films demonstrated one broad PL band which peak position shifts gradually to from 1.4 eV to 1.8 eV with the x decrease. Contrary to this, for the Six(Al2O3)1-x films two overlapped PL bands were observed in the 1.4-2.4 eV spectral range with peak positions at ~2.1 eV and ~1.7 eV accompanied by near-infrared tail. Comparative analysis of PL spectra of both types samples showed that the main contribution to PL spectra of Six(SiO2)1-x films is given by exciton recombination in the Si-ncs whereas PL emission of Six(Al2O3)1-x films is caused mainly by carrier recombination either via defects in matrix or via electron states at the Si-ncs/matrix interface.

Near-Infrared Light Emission from of Er-Doped ZnO Thin Film in Micropits Processed on Si Substrate

2006 ◽  
Vol 320 ◽  
pp. 113-116
Author(s):  
Shigeru Tanaka ◽  
Yukari Ishikawa ◽  
Naoki Ohashi ◽  
Junichi Niitsuma ◽  
Takashi Sekiguchi ◽  
...  
Keyword(s):  
Thin Film ◽  
Near Infrared ◽  
Light Emission ◽  
Infrared Light ◽  
Zno Thin Film ◽  
Si Substrate ◽  
Near Infrared Light ◽  
Transmission Electron ◽  
Doped Zno ◽  
Er Doped

We have obtained Er-doped ZnO thin film in a micropattern of reverse trapezoids processed on Si substrate by sputtering and ultrafine polishing techniques. Near-infrared light emission was detected successfully from the thin film filling a single micropit with 10 μm square. Transmission electron microscopy (TEM) observation showed epitaxial growth of ZnO crystals along the curvature of the micropit.

scholarly journals A facile method for preparing Yb3+-doped perovskite nanocrystals with ultra-stable near-infrared light emission

RSC Advances ◽  
2020 ◽  
Vol 10 (30) ◽  
pp. 17635-17641 ◽  
Author(s):  
Chunqian Zhang ◽  
Aidi Zhang ◽  
Taoran Liu ◽  
Lin Zhou ◽  
Jun Zheng ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Perovskite Nanocrystals ◽  
Excellent Stability

A facile method for fabricating CsPbBr3:Yb3+@SiO2 NCs which guarantees high PLQY and excellent stability at the same time.

scholarly journals Enhanced UV Light Emission by Core-Shell Upconverting Particles Powering up TiO2 Photocatalysis in Near-Infrared Light

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 232
Author(s):  
Agnieszka Jarosz-Duda ◽  
Paulina O’Callaghan ◽  
Joanna Kuncewicz ◽  
Przemysław Łabuz ◽  
Wojciech Macyk
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Uv Light ◽  
Protective Layer ◽  
Upconversion Emission ◽  
High Photocatalytic Activity ◽  
Infrared Light ◽  
Core Shell ◽  
The Core ◽  
Surface Luminescence

The core-shell NaYb0.99F4:Tm0.01@NaYF4 upconverting particles (UCPs) with a high UV emission to apply in NIR-driven photocatalysis were synthesized. The influence of the Yb3+ doping concentration in NaYxF4:Yb0.99−xTm0.01 core particles, and the role of the NaYF4 shell on the upconversion emission intensity of the UCPs were studied. The absorption of NIR light by the obtained UCPs was maximized by increasing the Yb3+ concentration in the core, reaching the maximum for Y3+-free particles (NaYb0.99F4:Tm0.01). Additionally, covering the NaYb0.99F4:Tm0.01 core with a protective layer of NaYF4 minimized the surface luminescence quenching, which significantly improved the efficiency of upconversion emission. The high intensity of the UV light emitted by the NaYb0.99F4:Tm0.01@NaYF4 under NIR irradiation resulted in a high photocatalytic activity of TiO2 (P25) mixed with the synthesized material.

scholarly journals SUBARU near-infrared multi-color images of Class II Young Stellar Object, RNO91

2006 ◽  
Vol 2 (S237) ◽  
pp. 447-447
Author(s):  
Satoshi Mayama ◽  
Motohide Tamura ◽  
Masahiko Hayashi
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Infrared Camera ◽  
Central Peak ◽  
Class Ii ◽  
Peak Position ◽  
Infrared Light ◽  
Molecular Outflows ◽  
The North ◽  
Optical Images

AbstractRNO91 is class II source currently in a transition phase between a protostar and a main-sequence star. It is known as a source of complex molecular outflows. Previous studies suggested that RNO91 was associated with a reflection nebula, a CO outflow, shock-excited H2 emission, and disk type structure. But the geometry of RNO91, especially its inner region, is not well confirmed yet. High resolution imaging is needed to understand the nature of RNO91 and its interaction with outflow. Thus, we conducted near-infrared imaging observations of RNO91 with the infrared camera CIAO mounted on the Subaru 8.2-m Telescope. We presented JHK band and optical images which resolved a complex asymmetrical circumstellar structure. We examined the color of RNO91 nebula and compared the geometry of the system suggested by our data with that already proposed on the basis of other studies. Our main results are as follows; 1. The K-band images show significant halo emission detected within ~2″ around the peak position while less halo emission is seen in shorter wavelength images such as J and optical. The nebula appears to become more circular and more diffuse with increasing wavelengths. The cut-off at 300AU derived from our radial surface brightness is consistent with the size of the polarization disk suggested by Draper & Tadhunter (1993). These consistencies indicate that this optically thick region is attributed to a disk-like structure.2. At J and optical, several bluer knot-like structures are detected around and beyond the halo emission. These bluer knots seen in our images are comparable to the size of the envelope detected in HCO+ emission surrounding RNO91 (Lee & Ho 2005). It is thus natural to suggest that these bluer knots are the near-infrared light scattered by an envelope structure which is disrupted by molecular outflows.3. The pseudo-true color composite image has an appearance of arc-shaped emission extending to the north and to the east through RNO91. On the counter part of this arc-shaped structure, the nebula appears to become more extended to the southwest from the central peak position in J band and optical images. We interpret these whole structures as a bottom of bipolar cavity seen relatively edge-on opening to the north and south directions.

Influence of Dislocation Loops on the Near-Infrared Light Emission From Silicon Diodes

2007 ◽  
Vol 54 (8) ◽  
pp. 1860-1866 ◽  
Author(s):  
Tu Hoang ◽  
J. Holleman ◽  
Phuong LeMinh ◽  
J. Schmitz ◽  
T. Mchedlidze ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Infrared Light ◽  
Dislocation Loops ◽  
Near Infrared Light

Near-infrared light-emitting devices from individual heavily Ga-doped ZnO microwires

2017 ◽  
Vol 5 (10) ◽  
pp. 2542-2551 ◽  
Author(s):  
Gao-Hang He ◽  
Ming-Ming Jiang ◽  
Lin Dong ◽  
Zhen-Zhong Zhang ◽  
Bing-Hui Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Doped Zno

Electrically driven near-infrared light-emission from individual heavily Ga-doped ZnO microwires has been achieved, which can be analogous to incandescent sources.

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