Novel and efficient near infrared (NIR) emitting phosphor, Ca2PO4Cl:Eu2+, Nd3+ was synthesized by conventional solid state reaction and characterized with X-ray diffraction, photoluminescence emission, photoluminescence excitation spectra and fluorescence decay measurements. When excited with 400nm, the phosphor gives broadband emission at 450nm, which corresponds to the allowed 5d→4f transition of Eu2+ and intense NIR emissions in the range 800–1400nm, which are assigned to the characteristic 4I9/2,11/2,13/2 transitions of Nd3+ ions. The dependence of visible and NIR emissions, lifetime and the energy transfer efficiency (ηETE) were investigated in detail. The PLE and PL spectra along with donor decay curves obtained under pulsed excitation have been used to establish the energy transfer mechanism between Eu2+-Nd3+ ions. The Eu2+→Nd3+ energy transfer efficiency obtained from the Eu2+ lifetimes in the single doped and co-doped samples reaches up to 41%. The critical distance between Eu2+ and Nd3+ in Ca2PO4Cl host was calculated, as 11.68Å. The Inokuti-Hirayama (I-H) model of sensitizer to activator energy transfer is applied in analysis of the non-exponential fluorescence decays of Eu2+-Nd3+ co-doped Ca2PO4Cl. From I-H curve fitting, it is inferred that the electric dipole–dipole interaction is the main process responsible for the energy transfer from Eu2+→Nd3+. The results indicate that sensitization of Nd3+ is possible via 4f-5d transition of Eu2+ in Ca2PO4Cl host.
Journal of Luminescence – Elsevier
Published: May 1, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.
All for just $49/month
Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.
Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.
It’s easy to organize your research with our built-in tools.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera