Chirality–Racemization Strategy Toward Copper (I) Iodide Hybrid Single‐Crystalline Scintillators for X‐Ray Detection and Imaging Applications

Abstract

Organic–inorganic hybrid copper(I)‐based halides have attracted great interest in the field of optoelectronics due to their low cost, non‐toxicity, large Stokes shift, and high photoluminescence quantum yields (PLQYs). Here, bulk zero‐dimensional (0D) organic‐inorganic hybrid copper(I)‐based (R,S‐2‐mpip)2Cu2I6 (mpip = methylpiperazinium, C5H14N22+) single crystals have been grown with equal stoichiometric ratios of R‐ and S‐2‐mpip ligands by chirality–racemization strategy for the first time. Interestingly, (R,S‐2‐mpip)2Cu2I6 single crystals exhibit strong blue–green photoluminescence (PL) located at 520 nm with large Stokes shift of about 230 nm and high PLQY of about 65.96%, which originates from self‐trapped excitons (STEs). More importantly, (R,S‐2‐mpip)2Cu2I6 single crystals also exhibit the strong radioluminescence (RL) at 520 nm, the fast X‐ray scintillation response with a light yield of about 47 000 photon MeV−1 and low detection limit of 6.48 nGyairs−1 when exposed to X‐ray irradiation condition, which is superior to that of other copper(I) iodide‐based hybrids. Based on the excellent characteristics, X‐ray imaging systems based on (R,S‐2‐mpip)2Cu2I6 single crystals exhibit the clear images of “QFNU” logo and crystal symbol pattern. This work not only deepens the understandings of material design and fundamental properties of these racemate systems, but also provides guidance for the further applications in the multi‐functional optoelectronics.

Strong Magnetically‐Responsive Circularly Polarized Phosphorescence and X‐Ray Scintillation in Ultrarobust Mn(II)–Organic Helical Chains

“…Considering the similarity of PL and RL profiles, the same emission origin for both processes can again be proposed. To prove the feasibility of X-ray scintillating applications, [53][54][55] the radioluminescence (RL) properties of the SS-1 and RR-1 single crystals have been systematically investigated. As shown in Figure 7a, the X-ray attenuation ratio of SS-1 single crystals was calculated as a function of photon energy, showing different degrees of attenuation for different photon energies.…”

In situ recrystallization of zero-dimensional hybrid metal halide glass-ceramics toward improved scintillation performance

“…4d). 5,22,23,[52][53][54][55] To demonstrate the practical application of the as-obtained HMH G-Cs as scintillators in X-ray imaging, we compared the spatial resolution of (BTP) 2 MnBr 4 G-C to that of glass samples. The (BTP) 2 MnBr 4 G-C exhibited excellent spatial resolution (14.25 lp mm −1 ), surpassing obviously that of the (BTP) 2 MnBr 4 glass (9.25 lp mm −1 ) due to the outstanding transmittance and high light yield (Fig.…”

Oxidation-Induced Dissolution Recrystallization Structural Transformation Strategy Enhanced Nonlinear Optical Effect of Hybrid Chiral Tin Bromide Single Crystals

“…R / S -2-mpip­[SnBr 3 ]Br single crystals were produced after natural cooling and crystallization for 1 day, followed by washing and drying, as seen in Figure a,b. Furthermore, according to the previously reported chirality–racemization strategy . After properly mixing in a 1:1 ratio, R -2-mpip and S -2-mpip similarly reacted with SnO in HBr before being heated to 80 °C until completely dissolved.…”