Crystal structure and photoluminescent property of Eu³⁺-doped K₃GdSi₂O₇

Abstract

Red emitting phosphors of K 3 (Gd 1−x Eu x )Si 2 O 7 were synthesized by the conventional solid-state reaction method, and the crystal structure and the photoluminescent property were investigated. In this structure, Gd 3+ ions occupy two sites in the GdO 6 triangular prism and the GdO 6 octahedron, and Eu 3+ ions are predominantly introduced into the triangular prismatic Gd 3+ sites from the results of the Rietveld analysis and the photoluminescence spectroscopy. Among the K 3 (Gd 1−x Eu x )Si 2 O 7 samples, the K 3 (Gd 0.1 Eu 0.9 )Si 2 O 7 (x = 0.9) phosphor exhibited the highest emission intensity of 116% in comparison with the commercial (Y 0.98 Eu 0.02 ) 2 O 2 S phosphor, caused by the effectively suppression of the concentration quenching in the structure.

Luminescence properties of Eu2O3-doped ZrO2–Y2O3 single crystals

“…[I red (R)/I orange (O) (R/O)] in the present work) is an important parameter for understanding PL mechanisms. 45,46 Thus, if the R/O ratio is ≥1, the ED transition is dominant and red light is emitted, whereas the MD transition is dominant if the R/O ratio is <1, and orange light is emitted. 47,48 The ratios of the integrated intensities for the ranges of 604-629 nm and 585-604 nm are shown in Fig.…”

Phosphors of Rb₃La₁₋<i>_x</i>Tb<i>_x</i>Si₂O₇ with K₃NdSi₂O₇-type structure

“…4), 5) In our previous study, we focused on K 3 GdSi 2 O 7 with a K 3 NdSi 2 O 7 -type structure, in which two Gd 3+ sites in the GdO 6 prism and GdO 6 octahedron are effectively separated by the KO 6 and SiO 4 units. 6) By introducing Eu 3+ ions as red-emission centers, the concentration quenching was suppressed up to K 3 Gd 0.1 Eu 0.9 Si 2 O 7 ; i.e., the optimal Eu 3+ doping amount was 90 %.…”

Preparation of red fluorescent materials for a solution process using europium-doped benzoguanamine

“…11,12) This process yields distinctive results in terms of the efficiency of the radiative process and the spectral characteristics of photoluminescence (PL) emission. These materials can be utilized in areas such as laser 13) and display device emitters, [14][15][16] as well as bioimaging, 17,18) providing highefficiency and stable luminescence across a wide range of wavelengths. Particularly, europium (Eu) has been extensively studied as a red-emitting material originating from 5 D 0 → 7 F 2 transition.…”