Luminescence and energy transfer of Tm³⁺ and Dy³⁺ co-doped Na₃ScSi₂O₇ phosphors

Abstract

A series of Tm3+ and Dy3+ ions single- or co-doped Na3ScSi2O7 (NSSO) phosphors were prepared by a conventional solid state reaction method.

Dazzling Red-Emitting Europium(III) Ion-Doped Ca2LaHf2Al3O12 Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

“…Then, we measured the PLQY ( η ) of Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphors using the following formula − herein L S stands for the sample’s emission spectrum and E S denotes the excitation spectrum with the Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphor, while E R represents the excitation spectrum without the Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphor. The obtained PLQY value of 64% for the Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphor is superior to that for several red phosphors including Li 3 Y 3 Te 2 O 12 :Eu 3+ (PLQY = 61%), Y 2 Mg 2 Al 2 Si 2 O 12 :Eu 3+ (PLQY = 60.5%), Li 6 CaLa 2 Nb 2 O 12 :Eu 3+ (PLQY = 51%), Li 2 TiO 3 :Mn 4+ (PLQY = 31.6%), CaGdAlO 4 :Mn 4+ (PLQY = 45%), and Li 4 AlSbO 6 :Mn 4+ (PLQY = 54.8%) …”

“…Particularly, the color purity of optimal Ca 2 LaHf 2 Al 3 O 12 :50% Eu 3+ phosphors reached 92.7%, surpassing that of N a 3 S c 2 ( P O 4 ) 3 : E u 3 + ( c o l o r p u r i t y = 8 7 % ) , 6 9 Gd 3 Zn 2 Nb 3 O 14 :Eu 3+ (color purity = 91.2%), 70 Ca 2 SiO 4 :Eu 3+ (color purity = 91%), 71 and CaWO 4 :Eu 3+ (color purity = 91.3%). 72 Then, we measured the PLQY (η) of Ca 2 LaHf 2 Al 3 O 12 :50% Eu 3+ phosphors using the following formula 73 phosphor is superior to that for several red phosphors i n c l u d i n g L i 3 Y 3 T e 2 O 1 2 :E u 3 + ( P L Q Y = 6 1 % ) , 7 7 Y 2 M g 2 A l 2 S i 2 O 1 2 : E u 3 + ( P L Q Y = 6 0 . 5 % ) , 2 6 Li 6 CaLa 2 Nb 2 O 12 :Eu 3+ (PLQY = 51%), 78 Li 2 TiO 3 :Mn 4+ (PLQY = 31.6%), 79 CaGdAlO 4 :Mn 4+ (PLQY = 45%), 80 and Li 4 AlSbO 6 :Mn 4+ (PLQY = 54.8%).…”

Synthesis and photoluminescent characterization of ceramic phosphors Li2MgGeO4:Ln3+ (Ln3+ = Pr3+ or Tm3+) under different excitation wavelengths

“…[21][22][23][24] Thulium doped inorganic phosphors could be also applicable in white light emitting diodes (wLEDs) through Dy 3+ co-doping. 25 Structural, thermal and optical properties of ceramics Li 2 -MgGeO 4 un-doped and doped with Er 3+ and Ho 3+ ions were described in our previous work. 26 Direct energy band gaps for Li 2 MgGeO 4 with Er 3+ and Ho 3+ are found to be 5.67 and 5.77 eV and they are comparable to the values reported earlier.…”

“…21–24 Thulium doped inorganic phosphors could be also applicable in white light emitting diodes (wLEDs) through Dy 3+ co-doping. 25…”

Cyan Broad-Band Emission Phosphor with Scandium Silicon Multiple-Ring Structure for White Light-Emitting Diodes and Field Emission Displays

“…Zhong found that the excellent luminescent properties and thermal stability of blue phosphor KBaScSi 2 O 7 :Eu 2+ arised from the fact that Sc has better rigid environment . Take scandium silicate phosphors as an example, due to the abundant Sc environment and weak electron-acoustic coupling in the crystal structure, the phosphors have high luminous efficiency and good thermal stability. − Therefore, the development of new silicic acid Sc phosphors with desired properties is important for basic research and application fields.…”