Ultrabright and Highly Efficient All‐Inorganic Zero‐Dimensional Perovskite Scintillators

Abstract

Low‐dimensional halide perovskites with excellent luminescent properties have become leading candidates for optoelectronic and radiation‐detection applications. In this work, Tl cation is incorporated into 0D perovskite Cs3Cu2I5 host and an ultrabright and efficient scintillator is developed for X‐ray and γ‐ray detection. The Tl‐doped Cs3Cu2I5 crystals exhibit a high photoluminescence quantum efficiency of 79.2%. The radioluminescence emission of Cs3Cu2I5:Tl crystal under X‐ray excitation consists of a self‐trapped exciton emission at 440 nm and a Tl‐related emission at 510 nm at room temperature. With optimized Tl doping, the Cs3Cu2I5 not only demonstrates about five‐times enhanced steady‐state scintillation yield up to 150 000 photons/MeV and an improvement of X‐ray detection limit from 103.6 to 66.3 nGy s−1, but also maintains an extremely low afterglow of 0.17% at 10 ms after X‐ray cut‐off. The Cs3Cu2I5:Tl also possess a remarkable energy resolution of 3.4% at 662 keV and an ultrahigh light yield of 87 000 photons/MeV under 137Cs γ‐ray radiation.

Highly Resolved X‐Ray Imaging Enabled by In(I) Doped Perovskite‐Like Cs3Cu2I5 Single Crystal Scintillator

“…It is even better than that of Tl + emission in Cs 3 Cu 2 I 5 host. [30] The luminescence and decay kinetics under X-ray excitation of the In doped Cs 3 Cu 2 I 5 SCs were systematically investigated. The steady-state RL spectra of Cs 3 Cu 2 I 5 :In samples are shown in Figure 3a.…”

“…Its decay time is 912 ns, close to the reported value. [22,28,29] For In doped samples, the profiles have to be fit using a two-exponential function. The scintillation decay as a function of In doping concentration is plotted in Figure 3g.…”

“…[21] Wu et al synthesized the Tl-doped Cs 3 Cu 2 I 5 SCs, and found that the Tl doping greatly enhanced the LY up to 87 000 photo ns per MeV under 137 Cs γ-ray radiation. [22] However, a drawback consists in the toxicity of Tl dopants. In fact, the current commercial scintillators, such as NaI:Tl, CsI:Tl and TlBr, also face the problem of toxicity risk.…”

Highly Efficient and Flexible Scintillation Screen Based on Manganese (II) Activated 2D Perovskite for Planar and Nonplanar High‐Resolution X‐Ray Imaging

“…Currently, two available schemes were adopted for X-ray detection: direct-detection based on semiconductor materials operating in currentto-current mode, [6][7][8] and indirect-detection based on scintillators working in photonto-current mode. [9][10][11][12][13][14][15][16][17][18] Indirect-detection type X-ray detectors occupy the majority of the market share because of their relatively low-cost and stability. [11,16] As the core component of the detector, scintillator is capable of converting X-ray into ultraviolet (UV)/visible light that can be collected by a sensor array (such as photomultiplier tube, [14] multipixel photon counter, [15] charge-coupled device, [16] and complementary metal-oxide-semiconductor).…”

“…[9][10][11][12][13][14][15][16][17][18] Indirect-detection type X-ray detectors occupy the majority of the market share because of their relatively low-cost and stability. [11,16] As the core component of the detector, scintillator is capable of converting X-ray into ultraviolet (UV)/visible light that can be collected by a sensor array (such as photomultiplier tube, [14] multipixel photon counter, [15] charge-coupled device, [16] and complementary metal-oxide-semiconductor). [17,18] Development over the decades has witnessed the emergence of various scintillators, which were classified according to their own characteristics to fit the demands of different occasions.…”