Abstract
Herein, a variety of single-phase full-spectrum emission phosphors doped with Eu2+ were synthesized. Under the 350 nm excitation, as K+ and Y3+ were introduced into Ca10Na(PO4)7 (CNP):1.5%Eu2+, respectively, the emission color of Ca9.85KyNa(1-y) (PO4)7:1.5%Eu2+ (0 ≤ y ≤ 1.0) was tuned from yellow to cyan, while that of Ca(9.85-z)NaY0.667z (PO4)7:1.5%Eu2+ (0 ≤ z ≤ 1.0) was tuned from yellow to green. The internal quantum yield (QY) of Ca9·85K0·4Na0·6(PO4)7 (CKNP):1.5%Eu2+ and Ca9·45NaY0·267(PO4)7 (CNYP):1.5%Eu2+ reached 47.47 % and 27.11 %, respectively. The introduction of K+ or Y3+ made Eu2+ selectively occupy the Ca sites and led to changes in the local environment of Eu2+, allowing for spectral tuning emission. In addition, the luminescence intensity of the samples retained 54.59 % and 31.34 % of their room temperature values. Eventually, two white light emitting diode (WLED) devices were fabricated, combining the synthesized white emitting phosphors with 365 nm ultraviolet (UV) chips. They exhibited high color rendering indices of 84.7 and 77.0, along with low correlated color temperatures of 5435 K and 5023 K. The Commission Internationale de L'Eclairage (CIE) color coordinates were (0.3349, 0.3975) and (0.3517, 0.4366), respectively. The results pointed to the phosphors' potential suitability for use in the WLED sector.
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