Multi-Dopant Engineering in Perovskite Cs₂SnCl₆: White Light Emitter and Spatially Luminescent Heterostructure

Abstract

Bi3+/Te4+ co-doped Cs2SnCl6 with dual emission spectrum (i.e., 450 and 575 nm) was achieved by a modified solution method, which can overcome the phase separation in the previous method for Cs2SnCl6 crystal growth. The two emission peaks arising from the two dopants Bi3+ and Te4+ have distinct photoluminescence (PL) lifetimes. Thus, the control of dopant ratio or PL delay time will regulate the PL intensity ratio between 450 and 575 nm peaks leading to adjustable emission color. The energy transfer between the two emission centers, which is confirmed by the optical spectra and PL lifetime, has a critical distance around 7.8 nm with a maximum of 50% transfer efficiency. The Bi3+/Te4+ co-doped Cs2SnCl6 with superior stability in water and aqua regia was fabricated into a single-phase white light-emitting diode. In the meantime, various luminescent heterostructures were obtained by epitaxial Cs2SnCl6 crystal growth with different dopants, which can broaden the study of composition engineering in halide perovskites.

Tunable Dual Emission in Bi3+/Te4+-Doped Cs2HfCl6 Double Perovskites for White Light-Emitting Diode Applications

“…The strategy of introducing Bi 3+ and Te 4+ in the host lattice takes effect in terms of the heterovalent/equivalent substitution of Hf 4+ . Te 4+ ions are doped to replace Hf of the [HfCl 6 ] 2– octahedron to form [TeCl 6 ] 2– octahedron because of the similar coordination characteristics. − Several representative XRD patterns of the as-prepared samples including pure Cs 2 HfCl 6 , Cs 2 HfCl 6 :0.41%Bi 3+ , Cs 2 HfCl 6 :1%Te 4+ , and Cs 2 HfCl 6 :Bi 3+ /7%Te 4+ are shown in Figure b, which are well indexed to the standard XRD pattern of Cs 2 ZrCl 6 (PDF #74-0505), and more XRD patterns of Bi 3+ /Te 4+ single- and co-doped Cs 2 HfCl 6 samples are shown in Figure S1. The undesired HfO 2 impurity from the raw material has no influence on optical properties.…”

Red‐Emitting Perovskite Variant Cs2PtCl6 Phosphor: Material Design, Luminous Mechanism, and Application in High‐Color‐Rendering White Light‐Emitting Diodes

“…[35] The A 2 BX 6 -type phosphor components and single-phase white phosphors have been used to construct white LEDs. [35][36][37][38][39][40] However, the resultant white LEDs, particularly the all-A 2 BX 6 white LEDs, exhibit insufficient color rendering due to the shortage of red light. [41] Therefore, to attain high-color-rendering all-A 2 BX 6 white LEDs, it is an urgent need to develop red-emitting phosphors in the family of A 2 BX 6 perovskite variants.To achieve intrinsic red emissions in the A 2 BX 6 perovskite variants, it is necessary to reduce the bandgaps of the perovskite variants.…”

Achieving Ultrahigh Efficiency Vacancy‐Ordered Double Perovskite Microcrystals via Ionic Liquids

“…In Figure 2a, 496.1 and 487.75 eV are obtained from the contributions of Sn 4+ 3d 3/2 and 3d 5/2 , while the adjacent 495.08 and 486.58 eV correspond to the Sn 2+ 3d 3/2 and 3d 5/2 . [18] The high-resolution XPS spectra of Zr elements show two peaks located at 185.9 and 183.6 eV that can be attributed to Zr 4+ 3d 3/2 and 3d 5/2 , respectively. [37] The peaks at 539.08 and 530.28 eV are contributed by Sb 3+ 3d 3/2 and 3d 5/2 (Figure S3, Supporting Information).…”

“…After the solution was cooled to room temperature, the precipitate was collected and washed three times using methanol. The final sample was obtained by drying at 80 °C for 3 h.Preparation of Sb or Bi-Doped Cs 2 ZrCl 6 in HCl: 8 mL of hydrochloric acid and 1 mmol of ZrCl 4 and x mmol (x = 0.05, 0.1, 0.2) of BiCl 3 (or SbCl 3 ) were added to a 20 mL glass vial in a fume hood and stirred at Small 2022,18, 2204198…”