Synthesis and Photoluminescence Properties of Eu3+‐Activated Ba2Cd(BO3)2 Red‐Emitting Phosphors for Near‐Ultraviolet Excited White Light‐Emitting Diodes

ABSTRACT A new class of rare‐earth doped borate phosphors, Ba 2 Cd(BO 3 ) 2 : x Eu 3+ ( x = 2, 3, 4, 5, and 6 mol%), was synthesized using the high‐temperature solid‐state reaction technique in air. X‐ray diffraction (XRD) confirmed the phase formation of Ba 2 Cd(BO 3 ) 2 , while Fourier transform infrared spectroscopy (FT‐IR) revealed the presence of trigonal [BO 3 ] units. The surface morphology was studied using field emission scanning electron microscopy (FE‐SEM), and energy dispersive spectroscopy (EDS) identified the elements. Photoluminescence (PL) analysis showed that the phosphors emitted at 592, 613, 652, and 701 nm, corresponding to the 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 transition of Eu 3+ ions, respectively. The 613 nm red emission, from the 5 D 0 → 7 F 2 transition, was strongest for the 6 mol% Eu 3+ sample. The emission intensity increased with Eu 3+ concentration, peaking at 6 mol%. CIE chromaticity, correlated color temperature (CCT), and color purity calculations showed acceptable color coordinates (0.6426 and 0.3548), a low CCT value (2355 K), and high purity (91.34%), making the 6 mol% Eu 3+ ‐doped phosphor ideal for red light in white light‐emitting diodes (WLEDs).