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Hybrid remote phosphors for white LEDs

Sofie Abé (UGent) , Jonas Joos (UGent) , Dorian Dupont (UGent) , Heleen Sijbom (UGent) , Yolanda Justo Zarraquiños (UGent) , Mickaël Tessier (UGent) , Koen Van den Eeckhout (UGent) , Guido Huyberechts, Philippe Smet (UGent) and Zeger Hens (UGent)
Author
Organization
Project
Center for nano- and biophotonics (NB-Photonics)
Abstract
Light-emitting diodes (LEDs) have successfully outgrown their indicator lamp stage to become increasingly used as white LEDs (wLEDs) in both lighting and display markets replacing incandescent and fluorescent lamps. Technically, current wLEDs are composed of a blue pumping LED and one or more color convertors, usually called phosphors, which are typically rare earth doped inorganic materials. As a backlight in displays these wLEDs often have the disadvantage that a substantial fraction of the emitted light needs to be filtered out. In general lighting, efficiency losses are often generated by an emission extending into the infrared region, while also color rendering can be suboptimal. Recently, the use of colloidal semiconductor nanocrystals – quantum dots (QDs) – as color convertor materials in wLEDs has gained attention as a technological solution to these problems. These luminescent materials with broad absorption mostly owe this interest to their tunable, narrow and efficient emission which enable emission spectra to be adjusted to the needs of different applications. In this presentation, we will discuss the recent research results obtained within NB-Photonics to improve both the performance and cost-efficiency of wLEDs for display and lighting applications. The focus lies on developing color convertor materials and implementing these in a remote phosphor configuration, thereby improving efficiency, (color) homogeneity and stability compared to conventional designs where the phosphor material is deposited directly on the LED chip. Currently, the use of hybrid phosphor layers is explored, consisting of a combination of rare-earth doped phosphors with quantum dots which are either based on nanocrystals of CdSe, InP or chalcopyrites. This work is related to the LumiCoR project, in which also other issues are tackled, including large scale production of high quality quantum dots, the development of economical synthesis routes for InP QDs and the study of cheaper lanthanide ion-free inorganic phosphors.

Citation

Please use this url to cite or link to this publication:

MLA
Abé, Sofie, et al. “Hybrid Remote Phosphors for White LEDs.” NB Photonics Annual Meeting, Abstracts, 2014.
APA
Abé, S., Joos, J., Dupont, D., Sijbom, H., Justo Zarraquiños, Y., Tessier, M., … Hens, Z. (2014). Hybrid remote phosphors for white LEDs. In NB Photonics annual meeting, Abstracts. Zwijnaarde, Belgium.
Chicago author-date
Abé, Sofie, Jonas Joos, Dorian Dupont, Heleen Sijbom, Yolanda Justo Zarraquiños, Mickaël Tessier, Koen Van den Eeckhout, Guido Huyberechts, Philippe Smet, and Zeger Hens. 2014. “Hybrid Remote Phosphors for White LEDs.” In NB Photonics Annual Meeting, Abstracts.
Chicago author-date (all authors)
Abé, Sofie, Jonas Joos, Dorian Dupont, Heleen Sijbom, Yolanda Justo Zarraquiños, Mickaël Tessier, Koen Van den Eeckhout, Guido Huyberechts, Philippe Smet, and Zeger Hens. 2014. “Hybrid Remote Phosphors for White LEDs.” In NB Photonics Annual Meeting, Abstracts.
Vancouver
1.
Abé S, Joos J, Dupont D, Sijbom H, Justo Zarraquiños Y, Tessier M, et al. Hybrid remote phosphors for white LEDs. In: NB Photonics annual meeting, Abstracts. 2014.
IEEE
[1]
S. Abé et al., “Hybrid remote phosphors for white LEDs,” in NB Photonics annual meeting, Abstracts, Zwijnaarde, Belgium, 2014.
@inproceedings{7025879,
  abstract     = {Light-emitting diodes (LEDs) have successfully outgrown their indicator lamp stage to become increasingly used as white LEDs (wLEDs) in both  lighting and display markets replacing incandescent and fluorescent lamps. Technically, current wLEDs are composed of a blue pumping LED and one or more color convertors, usually called phosphors, which are typically rare earth doped inorganic materials. As a backlight in displays these wLEDs often have the disadvantage that a substantial fraction of the emitted light needs to be filtered out. In general lighting, efficiency losses are often generated by an emission extending into the infrared region, while also color rendering can be suboptimal. Recently, the use of colloidal semiconductor nanocrystals – quantum dots (QDs) – as color convertor materials in wLEDs has gained attention as a technological solution to these problems. These luminescent materials with broad absorption mostly owe this interest to their tunable, narrow and efficient emission which enable emission spectra to be adjusted to the needs of different applications.
In this presentation, we will discuss the recent research results obtained within NB-Photonics to improve both the performance and cost-efficiency of wLEDs for display and lighting applications. The focus lies on developing color convertor materials and implementing these in a remote phosphor configuration, thereby improving efficiency, (color) homogeneity and stability compared to conventional designs where the phosphor material is deposited directly on the LED chip. Currently, the use of hybrid phosphor layers is explored, consisting of a combination of rare-earth doped phosphors with quantum dots which are either based on nanocrystals of CdSe, InP or chalcopyrites. This work is related to the LumiCoR project, in which also other issues are tackled, including large scale production of high quality quantum dots, the development of economical synthesis routes for InP QDs and the study of cheaper lanthanide ion-free inorganic phosphors.},
  author       = {Abé, Sofie and Joos, Jonas and Dupont, Dorian and Sijbom, Heleen and Justo Zarraquiños, Yolanda and Tessier, Mickaël and Van den Eeckhout, Koen and Huyberechts, Guido and Smet, Philippe and Hens, Zeger},
  booktitle    = {NB Photonics annual meeting, Abstracts},
  language     = {eng},
  location     = {Zwijnaarde, Belgium},
  title        = {Hybrid remote phosphors for white LEDs},
  year         = {2014},
}