Evaluation methods for retroreflectors and quantitative analysis of near-infrared upward reflective solar control window film—Part II: Optical properties evaluation and verification results

The correct specification of glazings for façades can reduce the energy consumption in buildings. The heat exchange occurs through transparent surfaces and radiation reaches the building as light and heat. Therefore, glazings significantly contribute to the heat transfer between outdoor and indoor spaces and act directly on daylighting and thermal comfort. This paper reports on the spectrophotometric characterization of glazings transmittance for the study of components of a modular façade system and its suitability for the climate of Portugal (temperate climate). The study focused on results of spectrophotometric measurements of optical properties, specifically the transmittance of some types of glazings (solar control, self-cleaning, low-e, float, and extra-clear) and two types of double glazings. The results show the percentage of transmission to ultraviolet, visible, and near-infrared regions and its importance, which enabled the analysis of the glazing efficiency regarding daylighting and the correlation to thermal performance. Subsidies and indications for the specification and adequate uses of transparent surfaces have been presented and complemented the datasheets available from the manufactures.

Download Full-text

Energy Saving and Tourism Sustainability: Solar Control Window Film in Hotel Rooms

Journal of Sustainable Tourism ◽

10.2167/jost803.0 ◽

2008 ◽

Vol 16 (5) ◽

pp. 563 ◽

Cited By ~ 1

Author(s):

W.W. Chan ◽

L.M. Mak ◽

Y.M. Chen ◽

Y.H. Wang ◽

H.R. Xie ◽

...

Keyword(s):

Energy Saving ◽

Control Window ◽

Solar Control ◽

Window Film

Download Full-text

The Effect of Nitrogen Incorporation on the Optical Properties of Si-Rich a-SiCx Films Deposited by VHF PECVD

Micromachines ◽

10.3390/mi12060637 ◽

2021 ◽

Vol 12 (6) ◽

pp. 637

Author(s):

Hongliang Li ◽

Zewen Lin ◽

Yanqing Guo ◽

Jie Song ◽

Rui Huang ◽

...

Keyword(s):

Optical Properties ◽

Near Infrared ◽

Chemical Vapor ◽

Wide Bandgap ◽

Nonradiative Recombination ◽

Very High Frequency ◽

N Content ◽

High Frequency Plasma ◽

Frequency Plasma ◽

N Incorporation

The influence of N incorporation on the optical properties of Si-rich a-SiCx films deposited by very high-frequency plasma-enhanced chemical vapor deposition (VHF PECVD) was investigated. The increase in N content in the films was found to cause a remarkable enhancement in photoluminescence (PL). Relative to the sample without N incorporation, the sample incorporated with 33% N showed a 22-fold improvement in PL. As the N content increased, the PL band gradually blueshifted from the near-infrared to the blue region, and the optical bandgap increased from 2.3 eV to 5.0 eV. The enhancement of PL was suggested mainly from the effective passivation of N to the nonradiative recombination centers in the samples. Given the strong PL and wide bandgap of the N incorporated samples, they were used to further design an anti-counterfeiting label.

Download Full-text

Cross Target Attributes and Sample Types Quantitative Analysis Modeling of Near-infrared Spectroscopy Based on Instance Transfer Learning

Measurement ◽

10.1016/j.measurement.2021.109340 ◽

2021 ◽

pp. 109340

Author(s):

Yan Yu ◽

Jipeng Huang ◽

Shuaishi Liu ◽

Juan Zhu ◽

Shili Liang

Keyword(s):

Infrared Spectroscopy ◽

Quantitative Analysis ◽

Transfer Learning ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

Target Attributes

Download Full-text

High performing flexible optoelectronic devices using thin films of topological insulator

Scientific Reports ◽

10.1038/s41598-020-80738-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Animesh Pandey ◽

Reena Yadav ◽

Mandeep Kaur ◽

Preetam Singh ◽

Anurag Gupta ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

Nonlinear Optical ◽

Near Infrared ◽

Optoelectronic Devices ◽

Nonlinear Optical Properties ◽

Metallic Surface ◽

Strong Light ◽

High Performing ◽

Decay Times

AbstractTopological insulators (TIs) possess exciting nonlinear optical properties due to presence of metallic surface states with the Dirac fermions and are predicted as a promising material for broadspectral phodotection ranging from UV (ultraviolet) to deep IR (infrared) or terahertz range. The recent experimental reports demonstrating nonlinear optical properties are mostly carried out on non-flexible substrates and there is a huge demand for the fabrication of high performing flexible optoelectronic devices using new exotic materials due to their potential applications in wearable devices, communications, sensors, imaging etc. Here first time we integrate the thin films of TIs (Bi2Te3) with the flexible PET (polyethylene terephthalate) substrate and report the strong light absorption properties in these devices. Owing to small band gap material, evolving bulk and gapless surface state conduction, we observe high responsivity and detectivity at NIR (near infrared) wavelengths (39 A/W, 6.1 × 108 Jones for 1064 nm and 58 A/W, 6.1 × 108 Jones for 1550 nm). TIs based flexible devices show that photocurrent is linearly dependent on the incident laser power and applied bias voltage. Devices also show very fast response and decay times. Thus we believe that the superior optoelectronic properties reported here pave the way for making TIs based flexible optoelectronic devices.

Download Full-text