Luminophores pour conversion de lumière

A LED convertor turns native blue light into warmer, eye-friendly color from yellow to white. Car headlights, lasers, new lighting & display technologies…; Phosphors may be the future way of lights.

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How does light conversion happen with phosphors?

Firstly, find a few definitions in order to understand what is the light conversion. Then, find a focus on inorganic luminescent materials: the phosphors.

Visible light gathers all the electromagnetic waves that are detected by human vision. In the vacuum, the visible spectrum is between 380nm and 750nm.
EM spectrumrevised
A Light-Emitting Diode, mostly known as LED, is an electronic device that emits light when crossed by an electrical current. The semiconductor (heart of the LED) emits in a narrow spectrum. That is why the LED often ranks as a “monochromatic” emitter. There are mainly UV and blue native LEDs.

The light conversion happens when a wavelength is transformed into another wavelength or more. The light conversion occurs either by a mix of powders dispersed in a matrix, or a ceramic convertor. Baikowski® provides Phosphors, designed for high performances of conversion. We dope our nano-phosphors with Cerium for blue LED conversion. We can also add other dopants upon request.

High power LED chip made with fine YAG powder
High power LED chip made with ceramic light converters

Properties of phosphors

Our phosphors show outstanding properties for various applications:

  • Unlike polymer matrix, ceramic converters allow high temperatures into the system. They provide very few alterations of the conversion and optimize diffusion. That is why ceramic converters are essential when it comes to high power LEDs and lasers.
  • Embedded phosphors could require nanoscale material in order to answer the needs of new semiconductor design emerging (3D LED for example).
LuAG powder under UV light phosphorescent
Nano phosphor under UV light

In addition, Baikowski’s YAGs and LuAGs show:

  • High crystallinity
  • Chemical purity
  • Optimized distribution of activators within the lattice. It optimizes optical properties (quantum efficiency…)
  • Submicronic control of particle size & particle size distribution. Thus, you will obtain a dense ceramic at low sintering temperature with the finest microstructure (low thickness & controlled light diffusion).

Moreover, we formulate YAGs and LuAGs products to unique customer requirements with a variety of dopants:

  • Nd, Cr, Er, Yb… for laser applications
  • Ce, Pr, Gd… for ceramic light converters & encapsulated phosphors

Applications with light conversion phosphors

You can find light conversion phosphors in multiple applications, such as:

  • High-power LEDs for automotive
  • Lasers for wavelength conversion properties (undoped YAG)
  • UV coatings in fluorescent tubes
  • LEDs for display
YAG tape cast piece illustrating blue LED light conversion
Tape casted YAG ceramic converting blue LED into warmer light

Processability of Baikowski® powders for light conversion

We provide nanophosphors and specialty powders for light conversion. Baikowski® products reach a high sintering reactivity without sintering aid. We make sure that activators are homogeneously distributed in the garnet lattice, in order to target maximum quantum efficiency.
Moreover, our powders adapt easily to the customer process:

  • Hot Pressing & HIP (Hot Isostatic Pressing)
  • Tape casting
  • Slip casting
  • Ceramic inkjet printing

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