Luminescence des ions activateurs dans les matériaux inorganiques et applications

Abstract

2014 Nous présentons les mécanismes de base de l'absorption d'un rayonnement de pompage et de l'émission de fluorescence des matériaux inorganiques luminescents et nous donnons la liste des principaux composés utilisés par la technologie moderne. Après avoir montré les relations entre les recherches conduites pour le développement des deux types de matériaux (luminophores polycristallins et monocristaux lasers) nous insistons plus sur l'état de l'art et les perspectives des recherches des luminophores pour l'éclairage, la télévision, les écrans renforçateurs de rayons X et les écrans électroluminescents. Abstract. 2014 We present the basic mechanisms of the absorption of the pumping radiation and the fluorescence emission of inorganic luminescent materials and we give the list of main compounds used by modern technology. Then, we show there were connections between polycrystalline phosphors and laser-material research. We insist on the present status and the future development of phosphors for fluorescent lighting, TV screens, X-ray intensifier screens and electroluminescent devices.

Rhodamine B absorbed by anodic porous alumina: Stokes and anti-Stokes luminescence study

“…For the radiative transfer, the activator (A) (RhB molecules) can absorb the photon emitted by the sensitiser (S) (alumina nanocrystallites). It is a transfer at length distance which is proportional to R À2 where R is the distance between A and S. The probability of radiative transfer is given by [21] …”

“…The resonant non-radiative transfer can occur if the exchanged interactions are at short distances. Its probability is given by [21] …”

Excitation process and photoluminescence properties of Tb3+ and Eu3+ ions in SnO2 and in SnO2: Porous silicon hosts

“…The resonant nonradiatif transfer can occur if the exchanged interactions are at short distances. It's probability is given by [19,20] …”

First Investigation of Optical Properties and Local Structure of <br/>Gd<sup>3+</sup> Doped Nano-Crystalline GeSe<sub>2</sub>

“…It is very important for luminescence research to find systems in which the emitted light lies in the visible region. The emitted luminescence spectra favorite some rare earth compounds to be used as laser materials, lamp phosphors or as x-ray phosphors [22][23][24]. In particular Gd 3+ compounds are interesting from a fundamental and a practical point of view [25].…”