Near-UV-pumped yellow emitting through energy transfer in Sr3NaY(PO4)3F:Ce3+, Mn2+ phosphors

High quantum efficiency and excellent color purity of red-emitting Eu3+-heavily doped Gd(BO2)3-Y3BO6-GdBO3 phosphors for NUV-pumped WLED applications

“…6 Thus, NUV-pumped novel red-emitting phosphors with high efficiency are in great demand to replace the current Y 2 O 2 S:Eu 3+ material for emerging applications. 4 On the one hand, higher efficiency of absorption value and emission intensity could be achieved by doping more Eu 3+ dopant content in non-concentration quenching hosts, such as Ca 3 Y 2−x B 4 O 12 :xEu 3+ (ref. 14) or Ba 6 Gd 2(1−x) Ti 4 O 17 :xEu 3+ .…”

“… 3 However, this approach has some drawbacks, such as a poor color rendering index (CRI < 80) and highly unexpected correlated color temperature (>4000 K) due to the shortage of red emission. 4 Consequently, significant efforts have been dedicated to exploring viable solutions to manipulate white light through the relevant combination of red, green, and blue (RGB) emissions. 5 The most common high-CRI pc-WLED is produced by two main techniques: (i) covering green and red-emitting phosphors on a blue LED chip and (ii) coating a mixture of blue, green, and red-emitting phosphors on a near-UV (NUV) LED chip.…”

“… 6 Thus, NUV-pumped novel red-emitting phosphors with high efficiency are in great demand to replace the current Y 2 O 2 S:Eu 3+ material for emerging applications. 4 …”