Intense broad-band absorption and efficient blue-emitting SrCa₂MgSi₂O₈:Eu²⁺ phosphor for high color-rendering white LED applications

Novel cyan‐emitting KBaScSi2O7:Eu2+ phosphors with ultrahigh quantum efficiency and excellent thermal stability for WLEDs

“…The room temperature PLE and PL spectra of KBSS: Eu 2+ phosphor is displayed in Figure . The PLE spectrum indicates a broad band in the range of 290‐450 nm ascribed to the electronic transition from the ground state 4 f 7 to excited state 4 f 6 5 d 1 of Eu 2+ ions . Clearly, the PLE spectrum covers the UV region, demonstrating that KBSS: Eu 2+ phosphor can be used in NUV/UV‐pumped LED.…”

“…The PLE spectrum indicates a broad band in the range of 290-450 nm ascribed to the electronic transition from the ground state 4f 7 to excited state 4f 6 5d 1 of Eu 2+ ions. 22,23 Clearly, the PLE spectrum covers the UV region, demonstrating that KBSS: Eu 2+ phosphor can be used in NUV/UV-pumped LED. Under 350 nm excitation, the PL spectrum of KBSS:Eu 2+ exhibits a broad and intense cyan emission band extending from 420 to 600 nm with a full-width half-maximum (FWHM) of 70 nm, which attributed to the allowed 4f 6 5d 1 → 4f 7 transition of Eu 2+ activators.…”

“…Among a large number of possible matrices, silicate compound system is deemed to be applicable candidates as the luminescence matrix because of their excellent chemical, physical, and thermal stability, relatively easy preparation as well as their abundance in nature . As a result, many Eu 2+ ‐doped silicate‐based blue‐ and green‐emitting phosphor have been investigated, for instance the commercial (Sr,Ba) 2 SiO 4 :Eu 2+ , RbNa(Li 3 SiO 4 ) 2 :Eu 2+ , K 2 Ba 7 Si 16 O 40 :Eu 2+ , KBaYSi 2 O 7 :Eu 2+ , RbBaScSi 3 O 9 :Eu 2+ , etc.…”

“…[18][19][20] Among a large number of possible matrices, silicate compound system is deemed to be applicable candidates as the luminescence matrix because of their excellent chemical, physical, and thermal stability, relatively easy preparation as well as their abundance in nature. 21,22 As a result, many Eu 2+ -doped silicate-based blue-and green-emitting phosphor have been investigated, for instance the commercial (Sr,Ba) 2 SiO 4 :Eu 2+ , RbNa(Li 3 SiO 4 ) 2 :Eu 2+ , 23 K 2 Ba 7 Si 16 O 40 :Eu 2+ , 24 KBaYSi 2 O 7 :Eu 2+ , 25 RbBaScSi 3 O 9 :Eu 2+ , 20 etc. Among them, the Sc silicates have special three dimensional framework structures comprising of abundant tetrahedra and octahedra, which provide adequate crystal chemistry environment for various active ions.…”

Novel blue-emitting KBaGdSi2O7:Eu2+ phosphor used for near-UV white-light LED

“…Up to now, much attention has been paid to explore blue-emitting phosphors, such as Li2Sr2Al(PO4)3 [9], RbBaPO4:Eu 2+ [10], Gd4.67Si3O13:Bi 3+ [11], Al1−xSixCxN1−x:Eu 2+ [12], etc. However, it still leaves much to be desired in some aspects including matched absorption region with commercial near-UV LED chip, facile synthesis condition and especially robust thermal stability [13][14]. Therefore, it is meaningful and urgent to explore novel luminescence matrices to satisfy the above requirements.…”