Excitation power regulated up-conversion luminescence chroma of lanthanide double-perovskite Cs2NaLnCl6 (Ln = Ho3+, Er3+, Tm3+) microcrystals
Source abstract
Abstract
Environmental-friendly lead-free double perovskite (DP) with superior photoluminescence (PL) properties are prospective candidates for advanced lighting and display devices. Herein, a series of Cs 2NaLnCl 6 (Ln = Ho 3+, Er 3+, Tm 3+ ) DP microcrystals (MCs) with pumping power-dependent up-conversion (UC) luminescence chroma are synthesized by simple hydrothermal method. XRD and EDS results demonstrate the formation of pure phase Cs 2NaLnCl 6 (Ln = Ho 3+, Er 3+, Tm 3+ ). The calculated bond lengths by Generalized-gradient approximation (GGA)-Perdew-Burke-Ernzerhof (PBE) method and XPS binding energy reveal a competition between [NaCl 6] 3- and [LnCl 6] 3- octahedra for Cl - . The projected density of state (PDOS) verifies that the electrons mainly concentrate at the [LnCl 6] 3- octahedra, providing sufficient electrons for GSA process of Ln 3+. Under 980 nm excitation, Cs 2NaHoCl 6 exhibits pure red emission (Ho 3+: 5F 5 → 5I 8) and the color vary from orange to red with increase of pump power. Cs 2NaErCl 6 displays intense green (Er 3+: 2H 11/2/ 4S 3/2 → 4I 15/2) and red (Er 3+: 4F 9/2 → 4I 15/2) emissions, the increase of pump power results in color variation from orange to green. Cs 2NaTmCl 6 demonstrates blue (Tm 3+: 1D 2 → 3F 4 and 1G 4 → 3H 6), green (Tm 3+: 1D 2 → 3H 5) and red (Tm 3+: 1G 4 → 3F 4 and 3F 2,3 → 3H 6) emissions, with a color regulation from blue to red by increase of pumping power. Variable UC emission chroma based on Cs 2NaLnCl 6 (Ln = Ho 3+, Er 3+, Tm 3+) DPs by excitation power regulation are proposed to validate their application in lighting and displaying.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Perovskite Materials and Applications · Luminescence Properties of Advanced Materials · Crystal Structures and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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