DOI: https://doi.org/10.29363/nanoge.emlem.2022.003
Publication date: 15th July 2022
Narrow-band line-emitter phosphors have enormous potential for use in LEDs, as they offer improved luminous efficacy (lm/W) for white LEDs, while maintaining high color rendering (CRI>90). Especially trivalent Eu-doped phosphors are ideal from an emitter perspective, due to their efficient and extremely narrow-band emission in the red spectral region. However, the major bottleneck for implementation of these phosphors in LEDs, is the lack of absorption in the blue spectral region. To solve this problem, we have been exploring nano-engineered interparticle energy transfer (IFRET), an innovative approach to decouple emission and excitation properties.1 Even though IFRET would enable the use of trivalent lanthanide-doped phosphors for solid state lighting applications in general, the nanoscale components of IFRET materials are more broadly of interest for next generations LEDs, as cutting-edge LED technology is moving towards micro-devices.
IFRET technology allows for almost independent engineering of the emission and excitation properties to harness the best properties of each phosphor material, as you can have two different materials acting as a sensitizer and emitter. This does, for example, enable blue-sensitization of Eu3+-doped materials. Harnessing IFRET and successful implementation in commercial devices require nanoscale control over very high quality nanomaterials. Especially Ce-doped nano-YAG is of interest for LED applications, due to its very stable and efficient emission, and strong absorption in the blue spectral range. However, this material is particularly challenging to make at the nanoscale.2 We have been developing high-quality (i.e. high absorption and quantum yield) nanophosphors, including nano-YAG, that could be implemented in IFRET applications and/or small-size LEDs.
These innovations could find applications beyond lanthanide doped phosphors, by combining these more conventional materials with new cutting-edge technologies like quantum dots. Furthermore the applications could go well beyond LEDs, including sensing, medical imaging, solar and displays. In this talk we will present our latest technological developments by discussing the underlying physics, progress and challenges in achieving nano-engineered phosphors for practical LEDs.
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