Adaptive Driving Beam (ADB) is a smart system that can automatically adjust the light distribution of the headlights according to the traffic conditions, such as the presence of oncoming vehicles or pedestrians. By creating a glare-free area around vehicles, ADB can provide optimal illumination at long distances for the driver without dazzling other road users, enhancing both safety and comfort at night. ADB technology rely on perception systems that gather data, software controls that trigger an appropriate response, and advanced headlamp optics incorporating YAG converters to carry out the command.
Light conversion phosphors role in the solid-state lighting and ADB technology?
The light source is a key component for ABD, which is usually based on LED (light-emitting diode) technology and light changes are mainly controlled with a LED matrix design.
If LED have efficiency, long lifetime, low power consumption and fast response advantages over conventional halogen or xenon lamps, they also have color light rendering and thermal stability challenges. For high-power applications such as ADB, thermal stability and luminescent efficiency of phosphors can overcome these drawbacks.
Indeed, light conversion phosphors are materials that can absorb light of a certain wavelength (usually blue or near-ultraviolet) and re-emit light of a different wavelength (usually yellow or red). By combining the original and the converted light, white light with a desired color temperature and color rendering index can be obtained. The ideal color temperature for headlight should be close to the sunlight (around 5000K-6000K) in order to provide optimal visibility for human eyes.
One of the most widely used light conversion phosphors for white LEDs is YAG:Ce3+ (yttrium aluminum garnet doped with cerium ions) that efficiently convert blue into yellow light, resulting in a warm white light with a high luminous efficacy. By producing a high brightness and contrast ratio, it helps to create a clear and sharp image on the road.
Baikowski® high crystallinity, phasic and chemical purity submicronic YAG:Ce powder offers optimized particle size and distribution that allows the production of YAG-based converters with outstanding performances such as:
- 🌟 High efficiency with minimal energy wasted as heat and high light-performance from the input source
- 🌟 A quick and accurate response to the input signal for precise adjustments.
- 🌟 Exceptional stability in both light color and brightness
Fully compatible with nanostructured blue diodes and various LED chip designs, our YAG nanophosphors enable device miniaturization>
Learn more about Baikowski® unique submicronic YAG powders
Custom YAG-based converters for high-performance ADB lighting
By doping, enhanced performance of YAG:Ce3+ can be achieved. Here are some examples that could comply with your ADB lighting specification needs:
- 🌟 Color rendering: Doping YAG:Ce3+ with Tb3+ (terbium ions) allows a broader emission spectrum that improves the color rendering index of the white light.
- 🌟 Emissive properties and stability: the addition of gadolinium (Gd3+) ions as a codopant ensures consistent color and brightness
- 🌟 Quantum efficiency: Europium codoping can boost the quantum efficiency of the YAG:Ce phosphor, resulting in enhanced light output
Do not hesitate to contact our commercial and R&D teams for tailored YAG design.