3 years ago

Luminescence properties of Li2SrSiO4:Eu2+ silicate yellow phosphors with high thermal stability for high-power efficiency white LED application

Siti Sarina Binti Nasir, Akihiro Tanaka, Shuto Yoshiara, Ariyuki Kato

Publication date: March 2019

Source: Journal of Luminescence, Volume 207

Author(s): Siti Sarina Binti Nasir, Akihiro Tanaka, Shuto Yoshiara, Ariyuki Kato


Li2SrSiO4:Eu2+ yellow phosphors were synthesized by Polymerized Complex Method using TEOS and their thermal stability was investigated. The synthesized phosphors exhibited a broad yellow emission band around 560 nm. The optimum H2/N2 reduction temperature and Eu concentration are 900 °C and 0.5% respectively, which show the highest PL intensity and 6 times higher than samples synthesized by conventional solid-state reaction at the same condition. In order to investigate the thermal stability, PL properties in temperature range from 16.4 K to 583 K were examined. The PL intensity remains 80% above at high temperature (438 K) compared with room temperature. Activation energy and internal quantum efficiency of samples are estimated to be 0.43 eV and 62% respectively. Emission processes in Li2SrSiO4:Eu2+ phosphor were discussed with configuration coordinate model. The results reveal that Li2SrSiO4:Eu2+ yellow phosphors shows excellent thermal stability and have feasibility in replacement of YAG:Ce3+ yellow phosphors in white LEDs application.

Graphical abstract


You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.