Radiology blues: Comparing occupational blue-light exposure to recommended safety standards.

Background: The blue-light hazard is a well-documented entity addressing the detrimental health effects of high-energy visible light photons in the range of 305 nm - 450 nm. Radiologists spend long hours in front of multiple light-emitting diode (LED)-based diagnostic monitors emitting blue light, predisposing them to potentially higher blue-light dosages than other health professionals.

Objectives: The authors aimed to quantify the blue light that radiology registrars are exposed to in daily viewing of diagnostic monitors and compared this with international occupational safety standards.

Energy Transfer Mechanisms and Optical Thermometry of BaMgF:Yb,Er Phosphor.

Motivated from our previous studies on the upconversion properties of BaMgF:Yb,Tb phosphor, here we investigated the upconversion properties of BaMgF:Yb,Er phosphor. We demonstrate a two-way versatile approach for the fine-tuning of emission from green to the red region, by varying the dopant concentration and adjusting the pulse width of an infrared laser. The mechanism involved in tuning the emission color by laser power and pulse width variation was illustrated in detail.

Calculated Nanocube Vacancy Formation Energy and Cohesion Energy at 0 K.

Nanoparticles of face-centered cubic Cu are modeled using the Sutton-Chen potential. Shapes ranging from perfect cubes through to octahedrons are modeled and characterized. Bulk properties, surface energies, vacancy formation energy, E , and cohesive energies, E , are investigated for particles simulated to up to 5 nm in diameter.

Spectroscopic Investigation of Up-Conversion Properties in Green Emitting BaMgF:Yb,Tb Phosphor.

In this work we have comprehensively studied the up-conversion (UC) properties of BaMgF:Yb,Tb phosphor for the first time. BaMgF:Yb,Tb phosphors were prepared by a simple and low cost precipitation method. To determine the influence of dopant concentration on luminescence properties, the corresponding UC luminescence spectra of BaMgF:Yb,Tb phosphors were studied under NIR excitation.