TemperatureDependent Luminescence of RedEmitting BaYBO: Eu Phosphors with Efficiencies Close to Unity for NearUV LEDs.

Materials (Basel)

Institute of Chemistry, Faculty of Chemistry and Geoscience, Vilnius University, Naugarduko 24, LT03225 Vilnius, Lithuania.

Published: February 2020


Category Ranking

98%

Total Visits

921

Avg Visit Duration

2 minutes

Citations

20

Article Abstract

Solid state white light sources based on a nearUV LED chip are gaining more and more attention. This is due to the increasing efficiency of nearUVemitting LED chips and wider phosphors selection if compared to devices based on blue LED chips. Here, a brief overview is given of the concepts of generating white light employing nearUV LED and some optical properties of the available phosphors are discussed. Finally, the synthesis and optical properties of very efficient redemitting BaYBO:Eu phosphor powder and ceramics is reported and discussed in terms of possible application as a red component in nearUV LEDbased white light sources.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040723PMC
http://dx.doi.org/10.3390/ma13030763DOI Listing

Publication Analysis

Top Keywords

white light
12
light sources
8
nearuv led
8
led chips
8
optical properties
8
temperaturedependent luminescence
4
luminescence redemitting
4
redemitting baybo
4
baybo phosphors
4
phosphors efficiencies
4

Similar Publications

Wafer thickness is a critical parameter in semiconductor manufacturing, influencing production costs, and chip performance. Traditional measurement methods using clamping devices often introduce errors due to uneven positioning or unstable clamping. This study enhances the dual-probe chromatic confocal system by incorporating a diffractive optical element that splits white light into three beams, with spectrometer wave peak counts detecting wafer tilt.

View Article and Find Full Text PDF

Light does not phase shift the circadian clock of subcutaneous adipose tissue in vitro.

NPJ Biol Timing Sleep

September 2025

Healthy Living Spaces Lab, Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Aachen, Germany.

The retinal photopigment melanopsin is also expressed in subcutaneous white adipose tissue (scWAT). Through melanopsin, light can modulate scWAT metabolism, but its impact on circadian phase is unclear. In vitro exposure of murine scWAT to bright light at different times over 24 h did not elicit phase shifts, unlike the response to corticosterone.

View Article and Find Full Text PDF

Regulating the electronic structure by doping can promote photoluminescence emission of low-dimensional metal halides for developing white-light-emitting devices. Here, 0D metal halides RbBiCl have achieved a transition from nonluminescence to effective self-trapped excitons (STEs) emission after Sb ion doping at room temperature. The femtosecond transient absorption spectrum reveals the nonradiative recombination was suppressed, whose lifetimes change from 93.

View Article and Find Full Text PDF

Introduction: Smoking after a cancer diagnosis is associated with poor outcomes whereas smoking cessation improves survival and other outcomes. Although professional societies and practice guidelines call for equitable tobacco treatment delivery in healthcare, disparities in tobacco-related disease burden persist.

Methods: In the context of an outpatient US cancer center's population-based tobacco treatment program, this study examines associations between cancer survivors' rural and Appalachian residence status and: 1) current tobacco use status, 2) decision to decline tobacco treatment, and 3) reason for declining assistance.

View Article and Find Full Text PDF

The International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use M10 guideline provides a global framework for bioanalytical method validation in studies intended for regulatory submission. While its structure ensures consistency and data reliability, the guideline also acknowledges that not all studies require the same level of validation. This paper examines where full compliance is essential and where scientific judgment allows for leaner, context-driven validation, such as in early-stage development, for additional matrices, metabolites, nonstandard biological matrices or studies intended for internal decision-making.

View Article and Find Full Text PDF