Optical Properties Investigation of Upconverting KGd(PO)(WO):20%Yb,Tm Phosphors.

Nowadays, scientists are interested in inorganic luminescence materials that can be excited with UV or NIR radiation and emit in the visible range. Such inorganic materials can be successfully used as luminescent or anti-counterfeiting pigments. In this work, we report the synthesis and optical properties investigation of solely Tm doped and Yb/Tm co-doped KGd(PO)(WO) phosphors.

Up-Converting KGd(PO)(WO):20%Yb,Ho Phosphors for Temperature Sensing.

Inorganic luminescent materials that can be excited with NIR radiation and emit in the visible spectrum have recently gained much scientific interest. Such materials can be utilized as anti-counterfeiting pigments, luminescent thermometers, bio-imaging agents, etc. In this work, we report the synthesis and optical properties of KGd(PO)(WO):Ho and KGd(PO)(WO):20%Yb,Ho powders.

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

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.

Optical Properties of Red-Emitting RbBi(PO)(MoO):Eu Powders and Ceramics with High Quantum Efficiency for White LEDs.

There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature.

Luminescence and Luminescence Quenching of KBi(PO)(MoO):Eu Phosphors with Efficiencies Close to Unity.

A very good light emitting diode (LED) phosphor must have strong absorption, high quantum efficiency, high color purity, and high quenching temperature. Our synthesized KBi(PO)(MoO):Eu phosphors possess all of the mentioned properties. The excitation of these phosphors with the near-UV or blue radiation results in a bright red luminescence dominated by the D → F transition at ∼615 nm.

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu(3+) phosphors and ceramics.

A good LED phosphor must possess strong enough absorption, high quantum yields, colour purity, and quenching temperatures. Our synthesized Y2Mo4O15:Eu(3+) phosphors possess all of these properties. Excitation of these materials with near-UV or blue radiation yields bright red emission and the colour coordinates are relatively stable upon temperature increase.