Luminescent properties of .BETA.-SiAlON:Eu2+ green phosphors synthesized by gas pressured sintering

Abstract

has great potentials as a down-conversion green phosphor for white light emitting diodes (LEDs) utilizing near UV or blue LEDs as the primary light source.

Room‐Temperature Ion‐Exchange‐Mediated Self‐Assembly toward Formamidinium Perovskite Nanoplates with Finely Tunable, Ultrapure Green Emissions for Achieving Rec. 2020 Displays

“…For comparison, several widely studied green downconverters, including CsPbBr 3 NCs, MAPbBr 3 NCs, self‐prepared CsPbBr 3 NPs (by the same IEMSA method), self‐prepared Cs 4 PbBr 6 powders (characterizations of the CsPbBr 3 NPs and the Cs 4 PbBr 6 powders are shown in Figures S9 and S10 (Supporting Information). Notably, the origin of the Cs 4 PbB 6 emission is still in debate now, and we have added a discussion in the Supporting Information), Cd‐based quantum dots (QDs), and several kinds of oxynitride phosphors . The Rec.…”

Photoluminescence properties of Eu2+-activated CaSi2O2N2: Redshift and concentration quenching

“…In such an environment, the 5d orbitals of Eu 2+ split into two energy levels, namely, T 2 and E, by the crystal field of CaSi 2 O 2 N 2 . 3,16,17 The energy for the barycenter of the two split levels ͑T 2 and E͒ and that for the centroid of 5d orbit in Fig. 6 can be calculated from the excitation spectrum and the distorted tetrahedron crystal environment, respectively.…”

“…1,2 Commercial white LEDs, widely used as outdoor lighting sources, comprise a blue LED chip and a ͑Y 1−x Gd x ͒ 3 ͑Al 1−y Ga y ͒O 12 :Ce 3+ cerium͑III͒-doped yttrium aluminum garnet yellow phosphor. 2,3 Nevertheless, their use in highly demanded applications, such as medical and architectural lighting, is rather limited due to the low color rendering index ͑R a ͒, the high correlated color temperature, and the lack of red light component. [2][3][4][5][6] Therefore, multiphosphor-converted white LEDs have emerged themselves as a promising option because they feature high color rendering properties and tunable color temperatures by applying appropriate green and red phosphors.…”

Elucidating Structure–Composition–Property Relationships of the β-SiAlON:Eu2+ Phosphor

“…Phosphor-converted light-emitting diodes (pc-LEDs) have emerged as leading candidates for next-generation lighting applications due to their exceptional efficiency and environmental friendliness compared to traditional lighting sources. Among the candidates for green phosphors, β-SiAlON:Eu 2+ is of particular interest due to its high quantum efficiency, narrow emission bandwidth (full width at half-maximum, or fwhm, of 45–55 nm), and outstanding thermal quenching behavior (90% at 150 °C), which makes it suitable for high-power LEDs as well as liquid crystal display (LCD) backlights with wide color gamut. − …”

“…β-SiAlON is derived from β-Si 3 N 4 (Figure a) via the substitution of Al and O for Si and N, respectively. Its chemical formula can be formally written as Si 6– z Al z O z N 8– z , with z typically ranging from 0 to 4.2. − The photoluminescence (PL) properties of β-SiAlON can be tuned by modification of z as well as the concentration of the Eu 2+ activator . Previous experiments ,, have established that limits on Eu 2+ doping (<2 mol%) and Al–O substitution concentration ( z < 0.5) apply for practical applications.…”