ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Orthorhombic crystal structured Dy³⁺ doped Li₂Cd₂(PO₄)₂ nanopowders for yellowish light emitting solid state lighting applications

Shaik Azad Basha, K. Srinivasarao, K. Daniel, B. V. Naveen Kumar, Y. Nirmal Rajeev, and Sandhya Cole

Department of Physics, Acharya Nagarjuna University, Guntur, India

E-mail: sandhya.cole@gmail.com

Received: 2 February 2026  Accepted: 5 June 2026

Abstract:

Dy³⁺ doped lithium cadmium orthophosphate (LCP=Li₂Cd₂(PO₄)₂) nanopowders (NPs) were synthesized using the Solid-State Reaction (SSR) method. The XRD analysis revealed the orthorhombic crystal structure with Pnma space group. The W-H plot and Scherrer’s methods were used to calculate the average crystallite size for both pure and Dy³⁺ doped LCP NPs. The elemental composition was verified by EDS analysis and the clustered irregular stone-like structure was identified using FE-SEM analysis. Raman and FT-IR analyses were used to identify the (PO₄)³⁻vibrational modes. The optical bandgap values of the pure and Dy³⁺ doped LCP samples were found to be between 5.19 and 5 0.52 eV using the DRS analysis. Using the PL spectra, samples show yellow emission at 573 nm (⁴F_9/2→ ⁶H_13/2) when excited at 347 nm (⁶H_15/2→ ⁶P_7/2) and concentration quenching, lifetime analysis, CCT, CP and photoluminescence quantum yield ≈ 02%. PL studies and photometric analysis are used to determine the yellowish emission of prepared samples. As by concluding results, the samples can be suitable for yellowish light emitting solid state lighting devices.

Keywords: Li2Cd2(PO4)2; Photoluminescence; FESEM; Dexter’s theory; PLQY; SSR method

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-026-05178-6

Chemical Papers 80 (11) 13267–13284 (2026)