Photoluminescence of nanosheets doped with rare earth ions

Tunable Photoluminescence of Bismuth‐ and Trivalent‐Lanthanide‐Doped Monolayer Perovskite Oxide Nanosheets

“…have great potential for application in optical sensors with high thermal, mechanical, and chemical stability. [1][2][3][4][5] The lanthanide and bismuth centers in perovskite nanosheets show strong visible-light emission under UV-light illumination, in which energy transfer occurs due to bandgap absorption in the perovskite framework to the luminescent centers by O 2− -Ln 3+ or O 2− -Bi 3+ charge-transfer transitions. [6] Because all luminescent centers in the perovskite nanosheet framework are located within ≈1 nm of the outermost surface of the nanosheet, the PL properties of the luminescent centers are sensitively influenced by changes in the environment surrounding the nanosheet, including humidity, pH, and mechanical stress.…”

Precipitation Synthesis and Color‐Tailorable Luminescence of α‐Zr(HPO4)2: RE3+(RE = Eu, Tb) Nanosheet Phosphors

“…Meanwhile, researchers have been capable of encapsulating rare earth ions into these inorganic matrices to develop new phosphors by taking advantage of the expandable interlayer spacing of nanosheets . The nanosheet‐based phosphors are quite interesting because the photoluminescence excitation energy can be effectively absorbed by nanosheets having a considerably large surface to volume ratio with respect to those of bulk materials . Simultaneously, the luminescent nanosheets have a geometric advantage over other types of particles for the use of optical and electro‐optical devices such as electroluminescence panels, in which a stack of functional layers are fabricated .…”

“…10 The nanosheet-based phosphors are quite interesting because the photoluminescence excitation energy can be effectively absorbed by nanosheets having a considerably large surface to volume ratio with respect to those of bulk materials. 11 Simultaneously, the luminescent nanosheets have a geometric advantage over other types of particles for the use of optical and electro-optical devices such as electroluminescence panels, in which a stack of functional layers are fabricated. 12 In addition, their luminescent properties are affected by adsorption since most of the atoms that constitute the nanosheets are in direct contact with adsorbed chemical species (H + or OH À ).…”