A prime red phosphor Ca3Gd(AlO)3(BO3)4:Eu3+ with high color purity for low color temperature pc-WLEDs

A series of excellent thermal stability red phosphors Ca3Gd(AlO)3(BO3)4:Eu3+ were synthesized by conventional solid-state reaction method. Through the fluorescence spectrometer, the research results make clear that this phosphor has a best excitation wavelength of 396 nm, and 0.7 mol% of doping is optimal. The interaction between ions causes a concentration-quenching phenomenon when the doping concentration is too high. Under the excitation of 396 nm ultraviolet light, there is a significant emission peak at 623 nm due to the energy level transition of 5D0→7F2 in the outer layer of the fluorescent powder. The color purity of the Ca3Gd0.3(AlO)3(BO3)4:0.7Eu3+ is 98.8 %, which means the corresponding red light emitted can effectively compensate for the missing red light component in white light-emitting diodes(WLEDs). The operating temperature of WLED typically hovers around 150 degrees Celsius. At such temperatures, the luminous efficiency of fluorescent powders remains remarkably resilient, peaking at 94.84 % relative to room conditions. Even when the temperature surges to 200 degrees Celsius, the luminous efficiency of fluorescent powders persists at an impressive 88.87 %. The energy band gap of Ca3Gd0.3(AlO)3(BO3)4:0.7Eu3+ is up to 5.05 eV, which further demonstrates its excellent thermal stability. Ca3Gd0.3(AlO)3(BO3)4:0.7Eu3+ phosphor used in the WLED device emits warm white light (CCT = 3628 K, CRI = 87.4). As a result of these results, the phosphor can be used as an excellent red light component in pc-WLEDs. •A series of Ca3Gd(AlO)3(BO3)4:Eu3+ phosphors were successfully synthesized.•The color purity of the Ca3Gd(AlO)3(BO3)4:0.7Eu3+ is 98.8 %.•The Ca3Gd(AlO)3(BO3)4:0.7Eu3+ phosphor has excellent thermal stability.•The pc-WLED device packaged with Ca3Gd(AlO)3(BO3)4:0.7Eu3+ phosphor can emit comfortable warm white light (CCT = 3628 K, CRI = 87.4).