The effect of Lu3+ doping upon YAG:Ce phosphor ceramics for high-power white LEDs

Synthesis and investigation of novel boron‐ and magnesium‐doped YAG:Ce and LuAG:Ce phosphor ceramics

“…Figures 9b and 10b show a broad band emission spectra of the Ce 3+ ions. Similarly as before this band appears due to the electron transition from the 5d 1 to the 4f 1 orbital [23]. The emission was measured by exciting the compounds with 450 nm wavelength light.…”

“…For all ceramics, electron transitions between 4f 1 , 5d 1 and 5d 2 levels are observed. These electron transitions are characteristic of the Ce 3+ ions and are exhibited as broad emission and excitation bands [23]. The excitation spectra (Part a) consist of two broad bands.…”

A single‐structured LuAG:Ce,Mn phosphor ceramics with high CRI for high‐power white LEDs

“…Another reason is the decreased transmittance of PCs with increasing Mn 2+ ‐Si 4+ content. The final reason is that the probability of Ce 3+ excited by blue light decreases with the grain size increases, due to the weakening scattering‐enhanced effect at grain boundaries 52 . Put it all together, the satisfied luminescence performance with R a up to 91, R 9 of 37.9, and LE as high as 85.07 lm/W are achieved for the single‐structured ceramic Ce02Mn7, which is better than LuAG:Ce,Mn transparent ceramics prepared by oxygen sintering 30 and some reported PCs in literature (shown in Table 2).…”

Deep-red-emitting phosphors of Mn4+-activated tantalite for high-sensitivity lifetime thermometry and security films

“…[1][2][3][4][5][6][7][8] Generally, common commercial pc-WLEDs are fabricated by applying high-efficiency rareearth (RE)-doped materials (i.e., Y 3 Al 5 O 12 :Ce 3+ , Y 2 O 2 S:Eu 3+ , (Sr, Ca)AlSiN 3 :Eu 2+ , BaMgAl 10 O 17 :Eu 2+ , and (Ba,Sr) 2 SiO 4 :Eu 2+ ) onto near-ultraviolet (NUV) or blue LED chips. [9][10][11][12][13] However, they suffered from high manufacturing cost due to expensive and deficient RE resources, which might be not good enough from an economic perspective. In light of this limitation, there is great demand for exploring good potential candidates with a high performance and a lower price.…”