title: Experimental observation of spatially resolved photo-luminescence intensity distribution in dual mode upconverting nanorod bundles.
abstract: A novel method for demonstration of photoluminescence intensity distribution in upconverting nanorod bundles using confocal microscopy is reported. Herein, a strategy for the synthesis of highly luminescent dual mode upconverting/downshift Y1.94O3:Ho3+0.02/Yb3+0.04nanorod bundles by a facile hydrothermal route has been introduced. These luminescent nanorod bundles exhibit strong green emission at 549 nm upon excitations at 449 nm and 980 nm with quantum efficiencies of ~6.3% and ~1.1%, respectively. The TEM/HRTEM results confirm that these bundles are composed of several individual nanorods with diameter of ~100 nm and length in the range of 1-3 μm. Furthermore, two dimensional spatially resolved photoluminescence intensity distribution study has been carried out using confocal photoluminescence microscope throughout the nanorod bundles. This study provides a new direction for the potential use of such emerging dual mode nanorod bundles as photon sources for next generation flat panel optical display devices, bio-medical applications, luminescent security ink and enhanced energy harvesting in photovoltaic applications.
authors.affiliation: Luminescent Materials and Devices Group, Materials Physics and Engineering Division, CSIR- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi, 110012, India.|Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus. Dr. K. S. Krishnan Road, New Delhi 110012, India.
authors.forename: Pawan
authors.initials: P
authors.lastname: Kumar
authors.affiliation: Luminescent Materials and Devices Group, Materials Physics and Engineering Division, CSIR- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi, 110012, India.|Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus. Dr. K. S. Krishnan Road, New Delhi 110012, India.
authors.forename: Satbir
authors.initials: S
authors.lastname: Singh
authors.affiliation: Advanced Materials and Devices Group, Physics of Energy Harvesting Division, CSIR - National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi, 110012, India.
authors.forename: V N
authors.initials: VN
authors.lastname: Singh
authors.affiliation: Metals, Alloys and Composites for Energy Applications Group, Physics of Energy Harvesting Division, CSIR - National Physical Laboratory, Dr K S Krishnan Road, New Delhi, 110012, India.
authors.forename: Nidhi
authors.initials: N
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Pittsburg State University, Pittsburg, KS, 66762, USA.
authors.forename: R K
authors.initials: RK
authors.lastname: Gupta
authors.affiliation: Luminescent Materials and Devices Group, Materials Physics and Engineering Division, CSIR- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi, 110012, India.
authors.forename: Bipin Kumar
authors.initials: BK
authors.lastname: Gupta