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.



Color modulation by selective excitation activated defects and complex cation distribution in Zn1−xMgxAl2O4 nanocrystals

Author affiliations

Abstract

Complex cation distribution in spinel solid solution, fosters defect generation and permutates the optical properties. To scrutinize the effect on structural properties, viz. the cation distribution and defect states upon substitution of Zn with Mg; and to tune the emission properties, Zn1−xMgxAl2O4 (0.01 ≤ x ≤ 0.30) nanocrystals are synthesized. The nanocrystals show increased inversion and generation of multiple defects, namely zinc vacancies, zinc interstitials, oxygen vacancies and antisite defects with increasing Mg content, which thereby impacts the optical band gap. Pentahedral coordination in addition to tetra- and octahedral coordination of Al has been observed, which infers the presence of oxygen vacancies and dangling bonds. Moire fringes formation has intimated the presence of two or more crystal lattices with higher Mg substitution. Band-to-band and defect-assisted photoluminescence shows the role of multiple defects, especially Image ID:d0dt01456g-t1.gif defect clusters, in deciphering the properties of the resulting crystals. Color change from bluish-white to pink has been achieved depending upon the excitation wavelength and emission mechanism, as proposed through a band model schematic. The presented study may be beneficial for designing the Zn1−xMgxAl2O4 nanocrystals with optimized emission properties.

Graphical abstract: Color modulation by selective excitation activated defects and complex cation distribution in Zn1−xMgxAl2O4 nanocrystals

Back to tab navigation

Supplementary files

Article information


Submitted
21 Apr 2020
Accepted
26 May 2020
First published
26 May 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Color modulation by selective excitation activated defects and complex cation distribution in Zn1−xMgxAl2O4 nanocrystals

M. Jain, Manju, M. Kumar, H. H. Lee, S. O. Won, K. H. Chae, A. Vij and A. Thakur, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01456G

Social activity

Search articles by author

Spotlight

Advertisements