Abstract
A series of intense green/orange (Ca1−xSrx)3SiO4Cl2:Eu2+ and Ca3SiO4Cl2−2yF2y:Eu2+ phosphors were synthesized by a high‐temperature (HT) solid‐state reaction and were characterized by means of X‐ray powder diffraction spectroscopy, photoluminescence excitation, and emission spectra. Both of the phosphors Ca3SiO4Cl2:Eu2+ with a low temperature (LT)/HT phase show intense broad absorption bands between 250 and 450 nm, matching well with the near‐ultraviolet (n‐UV) (380–420 nm) emission band of InGaN‐based chips, and exhibit a green emission (510 nm) and a tunable yellow (551 nm) to orange emission (577 nm), ascribed to the allowed 5d→4f transition of Eu2+ ion in LT‐ and HT phases, respectively. The green emission can be greatly enhanced by substitution of Ca2+ by Sr2+ and Cl− by F−. The emission intensity of Eu2+ is about 160% (x=0.01, y=0) and 270% (x=0, y=0.03) times as strong as that of Ca3SiO4Cl2:Eu2+. By combining with n‐UV (∼398 nm) InGaN chips, intense white light emitting diodes (LEDs) were made based on a blend of blue chlorophosphate phosphor, green Ca3SiO4Cl2:Eu2+ with a LT phase, and orange Ca3SiO4Cl2:Eu2+ with a HT phase. Tunable warm white (2648–4057 K) LEDs with a high color‐rendering index (86–94) were successfully fabricated.
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