Ordered assembly of hybrid room-temperature phosphorescence thin films showing polarized emission and the sensing of VOCs

2017 ◽  
Vol 53 (39) ◽  
pp. 5408-5411 ◽  
Author(s):  
Rui Gao ◽  
Dongpeng Yan
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Layer By Layer ◽  
Room Temperature Phosphorescence ◽  
Polarized Emission ◽  
Ordered Assembly

Long-lived room-temperature phosphorescence (RTP) thin films through a layer-by-layer (LBL) process present polarized RTP and serve as sensors for VOCs.

Direct white-light emitting room-temperature-phosphorescence thin films with tunable two-color polarized emission through orientational hydrogen-bonding layer-by-layer assembly

2018 ◽  
Vol 6 (16) ◽  
pp. 4444-4449 ◽  
Author(s):  
Rui Gao ◽  
Xiaoyu Fang ◽  
Dongpeng Yan
Keyword(s):  
Thin Films ◽  
Hydrogen Bonding ◽  
White Light ◽  
Room Temperature ◽  
Bonding Layer ◽  
Layer By Layer ◽  
Room Temperature Phosphorescence ◽  
Light Emitting ◽  
Polarized Emission ◽  
Layer Assembly

Molecule-based room-temperature-phosphorescence (RTP) materials have received much attention recently.

Enhanced transmittance and mobility of p-type copper iodide thin films prepared at room temperature via a layer-by-layer approach

2019 ◽  
Vol 361 ◽  
pp. 396-402 ◽  
Author(s):  
Fangjuan Geng ◽  
Lei Yang ◽  
Bing Dai ◽  
Shuai Guo ◽  
Gang Gao ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Layer By Layer ◽  
Copper Iodide ◽  
P Type

Blue‐Light‐Absorbing Thin Films Showing Ultralong Room‐Temperature Phosphorescence

2019 ◽  
Vol 31 (12) ◽  
pp. 1807887 ◽  
Author(s):  
Marine Louis ◽  
Heidi Thomas ◽  
Max Gmelch ◽  
Anna Haft ◽  
Felix Fries ◽  
...  
Keyword(s):  
Thin Films ◽  
Blue Light ◽  
Room Temperature ◽  
Room Temperature Phosphorescence

Donor-acceptor structure of coordination polymer with long-lived room temperature phosphorescence and angle-dependent polarized emission

CrystEngComm ◽  
2021 ◽  
Author(s):  
Wen-Jing Qin ◽  
Ji-Rui Zhang ◽  
Xu-Ke Tian ◽  
Xiao-Gang Yang ◽  
Yuming Guo
Keyword(s):  
Coordination Polymer ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Polarized Emission ◽  
New Strategy ◽  
Donor Acceptor

A new strategy to achieve long-lived room temperature phosphorescence performance has been developed by the formation of donor-acceptor structure in coordination polymer, which features lifetime (40.22 ms) three orders of...

Red Shift for CdTe Nanoparticle Thin Films and Suspensions During Heating

2008 ◽  
Vol 8 (5) ◽  
pp. 2544-2548 ◽  
Author(s):  
S. Dunn ◽  
H. C. Gardner ◽  
C. Bertoni ◽  
D. E. Gallardo ◽  
N. Gaponik ◽  
...  
Keyword(s):  
Thin Films ◽  
Scanning Probe Microscopy ◽  
Room Temperature ◽  
Red Shift ◽  
Scanning Probe ◽  
Initial Increase ◽  
Layer By Layer ◽  
Prolonged Heating ◽  
Temperature State ◽  
Stock Suspension

The work that we have conducted shows that temperature affects the wavelength of light emitted from CdTe nanoparticle clusters that are in a suspension or deposited into thin films via a layer-by-layer process. Compared with the stock suspension, the films show an initial photoluminescent shift, of circa 6–8 nm to the red, when the particles are deposited. A shift of circa 6–8 nm is also seen when the suspensions are first heated to 85 °C from room temperature (20 °C) having been stored in a fridge at 5 °C. This shift is non-recoverable. With continual cycling from room temperature to 85 °C the suspensions show a slight tendency for the emission to move increasingly to the red; whereas the films show no such tendency. In both cases, the range in emission is ca 10 nm from the room temperature state to 80 °C. The intensity of the emission from the film drops abruptly (ca 50% reduction) after one cycle of heating; in the suspension there is an initial increase (ca 3–5% increase) in intensity before it decays. We see that the shift towards the red has been attributed to energy transfer or a rearrangement of the packing of the particles in the thin films. After conducting analysis of the films using scanning probe microscopy we have determined that a change in the morphology is responsible for the permanent shift in emission wavelength associated with prolonged heating. The influence of traps has not been ruled out, but the morphological change in the samples is very large and is likely to be the dominating mechanism affecting change for the red shift at room temperature.

Studies on Water in the Hydration Chamber of a Modified Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 544-545
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electron Microscope ◽  
Steady State ◽  
Room Temperature ◽  
Small Mass ◽  
Equilibrium Pressure ◽  
Biological Objects ◽  
Mechanical Pump ◽  
Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

Interactions Between Al and Cr Thin Films

1976 ◽  
Vol 34 ◽  
pp. 638-639
Author(s):  
R. M. Anderson ◽  
T. M. Reith ◽  
M. J. Sullivan ◽  
E. K. Brandis
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Vacuum System ◽  
Processing Temperature ◽  
Diffusion Couples ◽  
Electronic Circuits ◽  
Intermetallic Formation ◽  
Si Substrates ◽  
Aluminum Silicon

Thin films of aluminum or aluminum-silicon can be used in conjunction with thin films of chromium in integrated electronic circuits. For some applications, these films exhibit undesirable reactions; in particular, intermetallic formation below 500 C must be inhibited or prevented. The Al films, being the principal current carriers in interconnective metal applications, are usually much thicker than the Cr; so one might expect Al-rich intermetallics to form when the processing temperature goes out of control. Unfortunately, the JCPDS and the literature do not contain enough data on the Al-rich phases CrAl7 and Cr2Al11, and the determination of these data was a secondary aim of this work.To define a matrix of Cr-Al diffusion couples, Cr-Al films were deposited with two sets of variables: Al or Al-Si, and broken vacuum or single pumpdown. All films were deposited on 2-1/4-inch thermally oxidized Si substrates. A 500-Å layer of Cr was deposited at 120 Å/min on substrates at room temperature, in a vacuum system that had been pumped to 2 x 10-6 Torr. Then, with or without vacuum break, a 1000-Å layer of Al or Al-Si was deposited at 35 Å/s, with the substrates still at room temperature.

Investigation of ultra-thin films of YBa2Cu3O7−δ grown on MgO

1990 ◽  
Vol 48 (4) ◽  
pp. 6-7
Author(s):  
S.K. Streiffer ◽  
C.B. Eom ◽  
J.C. Bravman ◽  
T.H. Geballet
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Deposition Process ◽  
Nucleation And Growth ◽  
Multilayer Structures ◽  
Rf Power ◽  
Oxygen Loss ◽  
Transmission Electron ◽  
Single Target ◽  
Mtorr Argon

The study of very thin (<15 nm) YBa2Cu3O7−δ (YBCO) films is necessary both for investigating the nucleation and growth of films of this material and for achieving a better understanding of multilayer structures incorporating such thin YBCO regions. We have used transmission electron microscopy to examine ultra-thin films grown on MgO substrates by single-target, off-axis magnetron sputtering; details of the deposition process have been reported elsewhere. Briefly, polished MgO substrates were attached to a block placed at 90° to the sputtering target and heated to 650 °C. The sputtering was performed in 10 mtorr oxygen and 40 mtorr argon with an rf power of 125 watts. After deposition, the chamber was vented to 500 torr oxygen and allowed to cool to room temperature. Because of YBCO’s susceptibility to environmental degradation and oxygen loss, the technique of Xi, et al. was followed and a protective overlayer of amorphous YBCO was deposited on the just-grown films.

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