Novel blue and green phosphors obtained from K₂ZrSi₃O₉:Eu²⁺ compounds with different charge compensation ions for LEDs under near-UV excitation

Abstract

Novel blue and green phosphors obtained from K2ZrSi3O9:Eu2+ compound by co-doping Al3+ and Sc3+ for LEDs under NUV excitation.

Structure and photoluminescence properties of red-emitting apatite-type phosphor NaY9(SiO4)6O2:Sm3+ with excellent quantum efficiency and thermal stability for solid-state lighting

“…Presently, the commercial phosphor-converted w -LEDs use yellow-emitting (YAG:Ce 3+ ) phosphor coated on a blue In-doped GaN chip or couple three red-, blue- and green-, (RGB tricolor) phosphors with near-ultraviolent ( n -UV) chips 6–8 . However, this method faces problems of low color rendering index (CRI) and a high correlated color temperature (CCT) due to the deficiency of sufficient red spectral component.…”

RE3+ (RE3+ = Tm3+, Tb3+ and Sm3+) ions activated Y6WO12 phosphors: Synthesis, photoluminescence, cathodoluminescence and thermal stability

“…To get better clarity about the thermal quenching phenomenon and to calculate the activation energy (E a ) for thermal quenching, the graphs of ln (I o /IÀ1) vs. 1/ K B T for YWO: 1Tm 3þ , YWO: 1Tb 3þ and YWO: 1Sm 3þ samples were plotted, respectively, as shown in Supporting Information (Fig. S4) according to the Arrhenius equation given as below: [37,38] …”

New single‐component multicolor emission Na1−xAl1+2xSi1−2xO4:xBi3+/Eu3+ phosphors via energy transfer

“…In the doped samples, M 3+ ions occupied Na + ions site and Al 3+ ions occupied Si 4+ ions site for their similar ionic radius, forming the co‐doped M 3+ ‐Al 3+ charge compensated pair and the introduction of Al 3+ ions did not change the occupying situation of M 3+ ions . In the case of M 3+ ‐Al 3+ co‐doped NAS, each M 3+ ions substituting Na + ions will produce 2 positive electricity defects (denoted as: ).…”