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Reports Summarize Luminescence Study Results from Chinese Academy of Science (An intense blue-emitting phosphor for near-ultraviolet pumped...

July 11, 2014



Reports Summarize Luminescence Study Results from Chinese Academy of Science (An intense blue-emitting phosphor for near-ultraviolet pumped white-light-emitting diodes: Ce3+ -activated beta-Ca2SiO4)

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Luminescence. According to news reporting originating from Changchun, People's Republic of China, by NewsRx correspondents, research stated, "More recently, Ce3+ activated gamma-Ca2SiO4 has been reported and it shows great potential application as a yellow-emitting phosphor for white LEDs. However, beta-Ca2SiO4, another known phase of Ca2SiO4, doped with Ce3+ is not available."

Our news editors obtained a quote from the research from the Chinese Academy of Science, "It is interesting to know if beta-Ca2SiO4:Ce3+ can also be suitable for white LEDs. For this reason, we synthesized a series of beta-Ca2SiO4:Ce3+ phosphors by solid state reaction. beta-Ca2SiO4:Ce3+ exhibits an intense blue emission band peaked at 425 nm with a bandwidth of 68 nm which is attributed to the typical Ce3+ 4f(0)5d(1)- > 4f(1) transitions. The integral intensity of the concentration-optimized beta-Ca2SiO4:Ce3+ can be as high as 71% of the commercial BAM blue phosphor upon 360 nm excitation. The excitation spectra of beta-Ca2SiO4:Ce3+ consist of three broad bands with maxima at 252, 289 and 348 nm, which are ascribed to the 4f(1)- > 4f(0)5d(1) transitions of Ce3+. Thermal quenching property of beta-Ca2SiO4:Ce3+ was evaluated and the results show that the integral PL intensity at 150 degrees C maintains about 93% of that at room temperature."

According to the news editors, the research concluded: "The excellent thermal stability and intense emission upon NUV light excitation suggest that beta-Ca2SiO4:Ce3+ can be used as a potential blue-emitting phosphor for NUV white LEDs."

For more information on this research see: An intense blue-emitting phosphor for near-ultraviolet pumped white-light-emitting diodes: Ce3+ -activated beta-Ca2SiO4. Journal of Luminescence, 2014;152():40-43. Journal of Luminescence can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Journal of Luminescence - www.elsevier.com/wps/product/cws_home/505700)

The news editors report that additional information may be obtained by contacting Z.D. Hao, Chinese Academy Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, People's Republic of China. Additional authors for this research include J.H. Zhang, X. Zhang, Y.S. Luo, L.G. Zhang and H.F. Zhao (see also Luminescence).

Keywords for this news article include: Asia, Changchun, Electronics, Luminescence, Light-emitting Diode, People's Republic of China

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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