High recorded color rendering index in single Ce,(Pr,Mn):YAG transparent ceramics for high-power white LEDs/LDs

Abstract

A recorded CRI of 84.8 in Ce,(Pr,Mn):YAG TCs for high-power LEDs/LDs was achieved by the synchronous doping of Pr3+ and Mn2+ ions.

(Sr, Ca)AlSiN3:Eu2+ Phosphor-Doped YAG:Ce3+ Transparent Ceramics as Novel Green-Light-Emitting Materials for White LEDs

“…As could be seen from the magnified diffraction peaks around 33.5 °C (shown in Figure 2 b), all the diffraction peaks of the SCASNE ceramics were shifted to lower angles. This demonstrated that (Sr, Ca)AlSiN 3 :Eu 2+ phosphor doping resulted in a larger unit cell [ 27 , 28 ]. To further acquire the effect of phosphor doping on the YAG:Ce 3+ crystal structure, crystal-structure refinement was performed using the Rietveld method with the software FULLPROF TM [ 29 ].…”

Tunable ultra-broadband full-visible-spectral emission of Bi3+-doped aluminate phosphors enabled by structure transformation and site occupancy engineering

“…[5][6][7] Afterwards, this deficiency of such pc-WLEDs can be overcome by replacing the yellow emitting phosphor with another yellow emitting phosphor having a sufficient amount of red component or by mixing red-emitting phosphors together and then coating on a blue emitting chip. For example, by introducing an activator ion to achieve sufficient red light emission, Ma et al doped Pr 3+ and Mn 2+ into YAG:Ce 3+ to achieve a WLED chip with an R a of 84.8 and a CCT of 4272 K. 8 And Lian et al mixed Cs 2 GeF 6 :Mn 4+ with YAG:Ce 3+ to obtain a WLED with R a = 90.5 and CCT = 3385 K. 9 However, the sharp peak of the blue LED chip has negative effects on the human body. 10 With the rapid development of semiconductor technology, an alternative method of realizing WLEDs is proposed by coating three primary color phosphors on one ultraviolet (UV) chip.…”

Effect of surface treatment upon luminous efficiency of YAG: Ce ceramics

“…White light‐emitting diodes (WLEDs) have been widely used as an emerging green solid‐state lighting source in the 21st century, with the advantages of high efficiency, low energy consumption, good stability, long lifetime, and environmental protection 1–4 . Commercial WLEDs were usually based on GaN/InGaN chips coated with YAG: Ce phosphors and organic resin under blue light excitation to obtain white light 5–8 .…”