A novel tunable extra-broad yellow-emitting nitride phosphor with zero-thermal-quenching property

Phosphor-converted white light-emitting diodes (pc-WLEDs) are bringing revolutionary changes to the lighting industry. To promote technological development, phosphors with tunable photoluminescence and excellent thermal stability are required. In our work, a novel tunable yellow-green emitting phosphor Li2CaSi2N4:Ce3+ is successfully synthesized through solid-state reaction. With the increase of Ce3+ concentration, the emission light could transfer from green to yellow region and the full width at half-maximum (FWHM) increases from 123 to 165 nm. Meanwhile, the phosphor does not exhibit thermal quenching up to 200 °C. The phosphor possesses a wider emission band and contains more cyan and red components than YAG:Ce3+. Combing Li2CaSi2N4:Ce3+ phosphor with a blue chip, pc-WLED with excellent technical indicators was obtained. Under the low voltage and current conditions, the phosphors also exhibit perfect stability with high current saturation.