Luminescent materials are materials that can absorb energy in a way then convert it into light radiation (non-equilibrium radiation). The process in which a substance absorbs energy from the outside and converts it into light energy is called luminescence. There are various luminescence modes of luminescent materials, including photoluminescence, cathodoluminescence, electroluminescence, thermo luminescence, photoluminescence, radioluminescence and so on.
Fig.1 The application of luminescent materials
Common and widely studied luminescent materials can be divided into electroluminescent materials (organic light-emitting diode is the main representative), photoluminescent materials, nonlinear optical materials, etc. according to the excitation mode.
- Organic light-emitting devices (OLED) materials: Organic electroluminescence refers to the phenomenon that organic semiconductor materials emit light when stimulated by an electric field, realizing the transformation from electric energy to light energy. Based on this phenomenon, OLED can be constructed with specific organic materials. OLED materials have many advantages such as low cost, no backlight, wide viewing Angle, good temperature adaptability, fast response, simple preparation process, light weight and flexible wear. Therefore, OLED products have been widely used in our daily life.
Fig.2 OLED materials in displayer, illumination and medical fields
- Photoluminescence materials: Photoluminescence refers to that an object depends on the external light source irradiation, so as to obtain energy and produce the phenomenon of excitation leading to luminescence. It roughly goes through three main stages: absorption, energy transfer and light emission. The absorption and emission of light all occur in the transition between energy levels and pass through the excited state. And the energy transfer is due to the motion of the excited state. Photoluminescence can be caused by ultraviolet, visible and infrared radiation, such as phosphorescence and fluorescence.
Fig.3 Photoluminescence materials: fluorescent powder
- Nonlinear optical materials (NLO): Nonlinear optical material refers to a kind of material whose frequency, phase and amplitude change under the action of external light field, electric field and strain field, thus causing changes in refractive index, light absorption and light scattering. They are capable of light wave frequency conversion and light signal processing. Therefore, these materials are widely used in laser frequency conversion, four-wave mixing, beam steering, image amplification, optical information processing, optical storage, optical fiber communication, underwater communication, laser countermeasures and nuclear fusion and also are important materials for future optoelectronic technology. They are mainly divided into second order nonlinear optical materials and third order nonlinear optical materials.
Fig.4 The application of Nonlinear optical materials in fiber-optic and nuclear fusion field
Alfa chemistry provides intermediates and related services for the above kinds of luminescent materials. If you do not find the product you need in the catalog, please contact us immediately, we will provide more detailed service. It is particularly noted that the complex of iridium and ruthenium, the transition metal, occupies an important position in the research of luminescent materials. In order to make it easier for customers to find, we assign the complex of iridium and ruthenium separately, hoping to bring you a better ordering experience.