Photoluminescence and electroluminescence characteristics of CaSiN 2 :Eu phosphor

Photoluminescence properties of Eu2+-activated sialon S-phase BaAlSi5O2N7

“…Recently, silicon nitride based compounds have been extensively studied as host lattices for phosphors, which exhibit unusual, interesting luminescence properties when activated by rare earth ions, such as M 2 Si 5 N 8 :Eu 2+ [1][2][3][4][5], M 2 Si 5 N 8 :Ce 3+ [6], MSi 2 O 2−␦ N 2+2/3␦ :Eu 2+ , Ce 3+ [7][8][9], CaSiN 2 :Eu 2+ [10], Ce 3+ [11], MgSiN 2 :Eu 2+ [12,13], MYSi 4 N 7 (M = Sr, Ba):Eu 2+ , Ce 3+ [14,15], MSi x Al 2−x O 4−x N x :Eu 2+ (M = Ca, Sr, Ba) [16], ␣-SiAlON:RE (RE = Eu 2+ , Ce 3+ , Yb 2+ , Tb 3+ , Pr 3+ , Sm 3+ ) [17][18][19][20][21][22][23], ␤-SiAlON:Eu 2+ [24], SrAlSi 5 O 2 N 7 :Eu 2+ [25], SrAl 2 SiO 3 N 2 :Eu 2+ [25], and CaAlSiN 3 :Eu 2+ [26]. Most importantly, these phosphors emit visible light efficiently under near-ultraviolet or blue light irradiation and have superior thermal and chemical stability to their oxide and sulfide counterparts, allowing them to be used as down-conversion luminescent materials for white light-emitting diodes (LEDs).…”

Synthesis, Crystal and Local Electronic Structures, and Photoluminescence Properties of Red‐Emitting CaAlzSiN2+z:Eu2+ with Orthorhombic Structure

“…Among the limited Eu 21 red-emitting phosphors, apart from the well-known M 2 Si 5 N 8 :Eu 21 (M 5 Ca, Sr, Ba) (orange-deep red, ranging from 580-650 nm), [1][2][3][4] CaAlSiN 3 :Eu 21 (deep red, ranging from 640-660 nm), and SrAlSiN 3 :Eu 21 (orange-red, at around 610 nm), 9 an earlier work has shown that CaSiN 2 :Eu 21 can emit orange-red light when excited by UV and visible light, showing a broad emission band peaking at about 620 nm for the cubic type of CaSiN 2 :Eu 21 prepared by a solid-state method at relatively low temperature (14001C) under a N 2 /H 2 atmosphere. 14 Recently, Eu 21 -activated MSiN 2 (M 5 Sr, Ba) was also found to be emitting orange-to-red light, depending on M. 15 The emission band of SrSiN 2 :Eu 21 is located at very deep red, ranging from 670 to 685 nm, while the emission band of BaSiN 2 :Eu 21 peaks in the range of 600-630 nm, with relatively broad bands. It was also observed that MSiN 2 :Eu 21 (M 5 Sr, Ba) has X-ray diffraction (XRD) patterns similar to those of the single crystal samples.…”

“…So far, the crystal structure of CaSiN 2 has been reported to exist in two forms: cubic and orthorhombic. The cubic crystal system was found in the powder materials of undoped and rare-earth-doped CaSiN 2 , 7,14,[19][20][21] while the orthorhombic phase was only obtained in the single crystal samples. 16,17 With respect to the cubic CaSiN 2 form, as mentioned above, besides Eu 21 -activated CaSiN 2 (no detailed Eu concentration) showing red emission at about 620 nm, 14 Ce 31 -activated CaSiN 2 also gives red emission with an emission maximum at about 625 nm, and the corresponding excitation maximum is located at significantly longer wavelengths of about 535 nm.…”

HP‐CaSiN2 – A New High‐Pressure Modification

“…The systems MSiN 2 (M = Mg, Ca, Sr, Ba) [2][3][4][17][18][19][20] in general stand out due to their multifaceted application in industry as, for example, sinter additives for Si 3 N 4 [21] ceramics or Eu 2+ -doped LED-phosphors. [14,[22][23][24][25][26][27] For the first time CaSiN 2 was mentioned 1968 by Laurent et al, [1] but the crystal structure was determined much later by Gál [3] and Ottinger et al [4] The synthesis of another modification, i.e., cubic CaSiN 2 , was postulated, [16,28] but neither a detailed crystallographic description has been presented nor the incorporation of oxygen could be definitively excluded.…”