Abstract
The emission of three infrared photons at 1700nm by Tm3+ for each absorbed photon at 465nm is reported as a function of the Tm3+ concentration in La2−2xTm2xBaZnO5 phosphors. It was observed that the intensity of the Tm3+3F4→3H6 emission with respect to emissions from the 1G4 state after 1G4 excitation at 465nm increases when the Tm3+ concentration is raised from x=0.001 to x=0.032. This increase is the accumulated effect of four different possibilities for cross-relaxation that can take place between neighboring Tm3+ ions, which explains the efficiency of the quantum tripling process. An optimum in the cross-relaxation efficiency was found for the La1.936Tm0.064BaZnO5 phosphor. At higher Tm3+ concentrations the 3F4→3H6 emission decreases as a result of concentration quenching. Quantum tripling can be used in high power IR phosphor converted LEDs or to increase the efficiency of small band gap solar cells like germanium.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
