High color rendering index composite phosphor-in-glass for high-power white laser lighting

A super-high brightness and excellent colour quality laser-driven white light source enables miniaturized endoscopy

“…Under the excitation of a laser power density of 5.94 W mm −2 , it gives a luminous flux of 433 lm and a luminous efficacy of 146 lm W −1 . To the best of our knowledge, both are the highest values among the reported values for laser-driven white light sources with Ra above 90, 17,21–25 as summarized in Table S3 (ESI†). Finally, the long-term stability of LuAG/CASN@Al was evaluated under a blue laser power density of 4.64 W mm −2 , which emits a stable white light with an unaltered luminous flux of 365 lm for 1440 min (Fig.…”

Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting

“…Meanwhile, the external quantum efficiency (EQE) of YAGG phosphor decreases from 96% to 90%, while that of CASN phosphor reduces from 89% to 70%. The reduction of quantum efficiency from the phosphor to the PiG is caused by the thermal quenching, in which the energy of the excited state gets back to the ground state through non-radiative transition [62,63]. The high QE reduction of CASN phosphor can be explained by the serious effect of thermal degradation owing to the possible chemical decomposition of nitride phosphor and the oxidation of Eu 2+ into Eu 3+ during the sintering process [64].…”

“…Although the SCs and TCs have high thermal conductivity, they require complicated and costly preparation process [24,25]. It is difficult to recover red and cyan emission spectra originating from the limited base materials of luminescence center in the SCs and TCs, which deteriorates the color quality of white LDs [26,27]. On the contrary, the PiGs avoid these drawbacks owing to the competitive advantages of simple preparation, low cost, phosphor versatility, and tunable luminescence [28][29][30].…”

Reducing the cyan-cavity: Lu2MAl4SiO12:Ce3+ (M = Mg, Ca, Sr and Ba) phosphor-in-glass film towards full-spectrum laser-driven lighting

“…, the classical combination of “LuAG:Ce 3+ + CASN:Eu 2+ ”) into glass upon co-sintering. 30,31 To address the issue of the poor thermal conductivity (TC) of glass, the PiG should be made into the form of a film adhered to a high-TC substrate. 12,32…”