Ca 5 Ga 6 O 14 :Eu 3+ : A novel phosphor with outstanding heat resistance for white light‐emitting diodes

Abstract A novel red‐emitting phosphor Ca 5 Ga 6 O 14 :Eu 3+ has been synthesized using solid‐state method. The excitation and emission spectra show that the phosphor can emit the red light with the main peak at 611 nm under excitation of the 280 and 393 nm UV chip and the optimal Eu 3+ concentration is determined to be x = 0.07. Analysis of emission spectrum shows that Eu 3+ occupy the center of noninversion symmetry. With the increase of Eu 3+ doping concentration, the decay time is prolonged due to deeper energy trap arising from nonequivalent substitution. Additionally, the measured thermal stability with 0.539 eV activation energy and calculated 90.5% color purity of optimal phosphor indicate that the phosphor has an enormous application potential in w‐LEDs industry.