Perovskite X‐Ray Detectors: Flexible, Printable Soft‐X‐Ray Detectors Based on All‐Inorganic Perovskite Quantum Dots (Adv. Mater. 30/2019)

Abstract

In article number 1901644, Babar Shabbir, Yupeng Zhang, Qiaoliang Bao, and co‐workers utilize inexpensive inkjet printing to homogeneously print a perovskite film consisting of all‐inorganic halide perovskite quantum dots on various substrates, which they further develop into an X‐ray detector. This type of detector is an ideal candidate for applications in soft/hard X‐ray detection and large‐area flat/flexible imaging technologies.

Preparation of Lead-free Two-Dimensional-Layered (C8H17NH3)2SnBr4 Perovskite Scintillators and Their Application in X-ray Imaging

“…21 It could provide higher sensitivity and spatial resolution of X-ray images upon exposure to reduced X-rays than the conventional detectors. 22,23 This finding might open up a new opportunity to break up the limitations of conventional scintillator materials in X-ray imaging technology.…”

“…Excitedly, in the past few years, novel perovskite materials have been explored as scintillators, and have realized many exciting X-ray detection characteristics, such as intense radioluminescence (RL), high conversion efficiency, low cost, simple fabrication, and so on. − Thus, perovskite scintillators have received increasing attention for X-ray imaging applications. − For instance, lead-based CsPbBr 3 perovskite nanocrystals were reported to have a strong conversion ability and long-term stability under X-ray irradiation, and thus have been exploited for X-ray imaging applications . It could provide higher sensitivity and spatial resolution of X-ray images upon exposure to reduced X-rays than the conventional detectors. , This finding might open up a new opportunity to break up the limitations of conventional scintillator materials in X-ray imaging technology. In addition, organic–inorganic lead halide perovskite materials (MAPbBr 3 ) have also attracted tremendous interest, and have been investigated to improve the X-ray sensitivity and detection performance in ionization radiation detection. , Nevertheless, the toxicity of lead halide perovskites is a severe disadvantage.…”

Optomechanics of Chiral Dielectric Metasurfaces

“…[34], the main purpose was that of controlling mechanical damping with light, while in refs. [26,27] the focus was on reflection and absorption tuning. The main peculiarity of our device resides instead in the use of a chiral pattern, with the consequent possibility to enable polarization-dependent optomechanical effects; moreover, as highlighted above, the choice of a dielectric material (GaAs) allows for almost lossless operation.…”

Multifunctional Microelectro-Opto-mechanical Platform Based on Phase-Transition Materials

“…However, those devices are intrinsically limited by either a low-transmission and -reflection modulation depth (<∼10%) 14 or a large actuation voltage (>10 V). 18,19 These disadvantages make such devices unsuitable for applications such as wavelength demultiplexing 20 and dynamic filters. 21,22 Some other reconfigurable MEOMS and NEOMS are based on thermal expansion actuation, 23,24 in which a bimorph, a suspended structure (cantilever or double-clamped beam) consisting of two materials with different coefficients of thermal expansion (CTE), is typically used.…”

“…This is comparable with the state-of-the-art MEOMS and NEOMS devices in the same wavelength range. 18,19 Such a large optical modulation depth of our MEOMS devices already promise various applications, including selective wavelength reflection spectrum filters and diffraction gratings. Other applications and diversity in responsive stimuli are demonstrated below.…”