Luminescence properties of M₂Si₅N₈:Ce³⁺(M = Ca, Sr, Ba) mixed nitrides prepared by metal hydrides as starting materials

Synthesis, Crystal Structure, and Luminescence Properties of Tunable Red-Emitting Nitride Solid Solutions (Ca1–xSrx)16Si17N34:Eu2+ for White LEDs

“…In recent years, in order to obtain warm white output, rareearth doped compounds have been investigated, such as metasilicate, 14−16 germanate, 17 phosphate, 18 borate, 19 oxyfluoride, 20 nitridosilicate, 21−24 related SiAlONs, 25 and so on. As a kind of important luminescent materials, nitridosilicate materials with rare-earth ions are widely investigated due to their excellent luminescent properties and high chemical and thermal stability; examples include M 2 Si 5 N 8 :Eu 2+ /Ce 3+ , 20,26,27 CaSiN 2 :(Eu 2+ /Ce 3+ ), 28−30 and MSiN 2 :Eu 2+ (M = Sr, Ba). 31 From earlier work, we can see that under the excitation of UV a visible wave CaSiN 2 :Eu 2+ can emit orange−red light.…”

Luminescence properties of CaAlSiN3:Eu2+ phosphor prepared by direct-nitriding method using fine metal hydride powders

“…Since these hydride powders are highly reactive, the present authors have synthesized M 2 Si 5 N 8 :Ce 3+ (M = Ca, Sr, Ba) phosphors by the direct-nitriding method using an appropriate mixture of MSiH x , Si 3 N 4 , and CeF 3 as the starting materials [20], so that good luminescence properties are observed on them.…”

Preparation of Red Phosphor Sr2Si5N8: Eu2+ by Pellet Method and Its Optical Characteristics

“…Rare earth-doped nitride phosphors exhibit excellent luminescence properties, such as high thermal stability and luminous efficiency [9,10]. In particular, M 2 Si 5 N 8 : Eu 2+ (M = Ca, Sr, Ba) phosphors give a broad emission band from 570 to 680 nm due to the 5d−4f parity-allowed transition of Eu 2+ , when excited by blue or near-UV LED chips.…”

“…Other common synthesis methods include carbothermal reduction and the nitridation of oxides, which can easily introduce impurities and make the phase impure. These issues impair the absorption and emission properties of the phosphor [10,[16][17][18][19]. Therefore, a new synthesis method of M 2 Si 5 N 8 : Eu 2+ (M = Ca, Sr, Ba) phosphors without the above disadvantages are urgent, with great theoretical and practical importance.…”