MgAl2O4:Ho3+ Nanophosphors: Electrochemical Sensor, Photoluminescence and Photocatalytic Applications

S.N. Manjula1,2,, M. Chandrasekhar2,*,, M.R. Anil Kumar3,, N. Raghavendra2,, C.R. Ravikumar2,*,, H.C. Ananda Murthy4,5, and H. Nagabhushana6,

1Department of Physics, SJR College for Women, Rajajinagar, Bengaluru-560010, India

2Research Center, Department of Science, East West Institute of Technology, (Affiliated to Visvesvaraya Technological University), Bangalore-560091, India

3Department of Chemical and Materials Engineering, Gina Cody School of Engineering and Computer Science, Concordia University, Montreal, Canada, H3G 2W1

4Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, PO Box 1888, Adama, Ethiopia

5Department of Prosthodontics, Saveetha Dental College & Hospital, Saveetha Institute of Medical and Technical Science (SIMATS), Saveetha University, Chennai-600077, India

6Prof. C.N.R. Rao Center for Advanced Materials, Tumkur University, Tumkur-572103, India

*Corresponding authors: E-mail:;


Ho3+-doped MgAl2O4 nanophosphors (1-11 mol%) was synthesised via solution combustion method using oxalyl dihydrazide (ODH) as fuel. The findings revealed a range of band gap energies (Eg) between 4.86 and 5.42 eV. It was confirmed that these values correspond extremely well with the experimental data using the DFT approach. The Ho3+ ions in the host undergo f-f transitions that are triggered at 406 nm and as a result, exhibit discrete photoluminescence emission peaks between 406 and 605 nm. Enhanced MgAl2O4 have CIE coordinates from orange-red to yellow region and 97% colour purity. Photocatalytic properties of nanophosphors under UV light led to the discovery that a rapid orange-red dye is activated at 493 nm. Removal of fast orange red (F-OR) dye using the new photocatalysts and MgAl2O4:Ho3+ nanophosphors has been demonstrated. The investigation showed that 89.02% of the dye lost its colour after being exposed to radiation for 120 min. The modified MgAl2O4:Ho3+ carbon paste electrode used in the cyclic voltametric (CV) technique for lead pollution detection. Based on their electrochemical performance, it is concluded that MgAl2O4:Ho3+ nanophosphors are a viable material for lead detecting electrodes.


Nanophosphors, MgAl2O4:Ho3+, Solution combustion, Fast orange red dye, Photocatalysis, Electrochemical sensor.

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