Highly efficient yellow emission and abnormal thermal quenching in Mn²⁺-doped Rb₄CdCl₆

Abstract

In this paper, Mn2+ doped Rb4CdCl6 perovskite single crystals were prepared by hydrothermal method. The Rb4CdCl6:Mn2+ metal halide perovskites exhibit yellow emission with photoluminescence quantum yields (PLQY) as high as...

Metal halides RbCdCl3:Sb3+ and Rb4CdCl6:Sb3+ with yellow and cyan emissions obtained via a facile hydrothermal process

“…The undoped Rb 4 CdCl 6 phosphor had a weak emission peak centered at 490 nm under excitation at 297 nm, which was in line with a prior result. 11 RbCdCl 3 was much weaker and did not show the phenomenon of luminescence. Due to strong electron-phonon interactions in the metal halide materials with a soft lattice, the Rb 4 CdCl 6 host STEs were thought to be responsible for the broad emission band with a significant Stokes shift of 193 nm.…”

“…8 These so-called metal halides, such as Cs 2 SnCl 6 , Rb 4 CdCl 6 , and Cs 2 ZrCl 6 , have closely packed photogenerated charge carriers which foster charge recombination and light emission. [9][10][11][12] The addition of different dopant ions, which produce additional energy levels for sustaining excitons of adjustable energies in the host lattice, also makes it possible to easily adjust the emission lines of these crystals. For instance, Sb 3+ -doped metal halides with coordination-dependent emission have been found to exhibit highly effective and low-toxic multicolor photoluminescence properties.…”

Dexter Energy Transfer in Zero-Dimensional Inorganic Metal Halides for Obtaining Near-Unity PLQY via Sb3+/Mn2+ Codoping

“…The Mn 2+doped Rb 4 CdCl 6 single crystal fluoresces with a very dim yellow under UV light. Intriguingly, the Mn 2+ -doped Rb 4 CdCl 6 powders prepared by other methods, 53 such as grinding, usually show bright yellow emission, which may be attributed to the embedded Rb 3 Cd 2 Cl 7 nanocrystals, 54 resembling a CsPbBr 3 /Cs 4 PbBr 6 hybrid system. 55 The Sb 3+ -doped and Sb 3+ /Mn 2+ -co-doped samples fluoresce green and bright yellow under UV light, respectively, indicating the successful combination of Sb 3+ and Mn 2+ emissions.…”

Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint

“…In some papers, NTQ has been termed as abnormal thermal quenching, zero thermal quenching [1][2][3], anti-thermal quenching [4], etc. NTQ has been reportedly observed in a wide variety of phosphors, such as those singly doped with rare earth ions , transition metal ions [23][24][25][26][27][28][29][30][31][32][33][34][35][36], ns 2 ions (Bi 3+ ) [37]; those doubly doped and triply doped with rare earth and transition metal ions [38][39][40][41][42], liquid-crystalline molecules and undoped metal halide [43,44]; as well as in up-conversion phosphor [45,46]. In these papers, the degree of NTQ, that is, the magnitude of the emission spectral intensity enhancement in the phosphor at high temperatures compared to the value at low temperature, ranges from 0.3% [10] to 34,700% [28].…”