Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Strong structural phase sensitive rare-earth photoluminescence color flips in KLaF4:RE3+ (RE3+ = Eu3+ , Er3+ /Yb3+ ) nanocrystals

Abstract

Systematic and strong rare-earth photoluminescence (PL) color flips which are highly sensitive to the structural phase transformation in KLaF4:RE3+ (RE3+ = Eu3+ , Er3+ /Yb3+ ) nanocrystals are demonstrated. A room-temperature wet chemical synthesis at various reaction times produce systematic conversion from cubic (α, space group Fm-3m) to hexagonal (β, space group P6 @#x0305;2m) polymorph nanocrystals of 4 to 8 nm sizes. The unusual down-conversion photoluminescence (DC-PL) asymmetric ratio between the hypersensitive transition (5D07F2, Red) to that of nearly invariant transition (5D07F1, Orange)(R/O from 1.2 to 3.0) of KLaF4:Eu3+ is substantially affected by the site-selective occupancy and local symmetry around Eu3+ ions, according to the crystal packing transformation. The NIR excited up-conversion photoluminescence (UC-PL) of Er3+ ions produce strong color flip from green (2H11/2 and 4S3/2) to red (4F9/2) dominated emissions based on their cubic or hexagonal crystal packing. The site occupancy and phonon energies strongly influence various nonlinear energy transfer mechanisms within the RE3+ ion energies and the results are explained accordingly. The presented study substantially explains the local host effects and these two distinct polymorph nanoparticles can be potentially utilized to color-specific studies related to applications such as color-specific biological in-vitro and in-vivo imaging and other optoelectronic device applications.

Back to tab navigation

Supplementary files

Article information


Submitted
29 Mar 2020
Accepted
25 Jun 2020
First published
26 Jun 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

Strong structural phase sensitive rare-earth photoluminescence color flips in KLaF4:RE3+ (RE3+ = Eu3+ , Er3+ /Yb3+ ) nanocrystals

R. Bajaj, M. Gupta, R. Nagarajan, S. R. Allam and G. V. Prakash, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT01179G

Social activity

Search articles by author

Spotlight

Advertisements