Although porous anodized aluminum oxide layer can be used to extract scintillation light from a LYSO scintillator, the low refractive index contrast of porous AAO layer obtains a moderate enhancement. In this investigation, we have designed and fabricated a modified porous anodized aluminum oxide layer with conformal deposition layer of high refractive index material of TiO2 on the surface of LYSO scintillator, achieving a significant enhancement by 60% with wavelength- and angle-integrated emission intensity. The fabrication method of the present study is simple and low-cost for the large area applications in the field of radiation detection.

In this investigation, we have demonstrated that a modified self-assembled photonic crystal with conformal high refractive index material TiO2 can achieve a great enhancement of light extraction efficiency. A 2.26 fold wavelength- and angle-integrated enhancement ratio can be achieved. The conformal layer increases the number of leaky modes and thus improve the extraction efficiency. The enhancement is attributed to the leaky modes based on the individual microspheres with conformal layer. Their low quality factors with a broadband characteristic are advantageous to the broadband enhancement for the emission spectra of plastic scintillator. Furthermore, the dense conformal layers have excellent combination with the self-assembled microspheres and the whole preparation process cannot destroy the plastic scintillator, which is beneficial to the practical application.

•We propose a 2D photonic crystal structure to enhance the light extraction of scintillator.•This structure is a periodic array of hexagonally close-packed polystyrene nanosphere.•The maximum enhancement of extraction efficiency reaches 25%.•The enhancement shows angular-dependence and wavelength-dependence.In order to improve the light extraction efficiency for Tb3+-doped glass scintillator, we propose an effective approach by incorporating a two-dimensional photonic crystal structure: a periodic array of hexagonally close-packed polystyrene nanosphere monolayer onto glass surface. The in-plane vector for the light suffering total internal reflection is changed into light cone resulting light emission out of glass. The optimized diameter of polystyrene nanosphere is 500 nm and the maximum enhancement of extraction efficiency reaches 25%. The enhancement shows angular dependence from the far-filed distribution pattern.

•Cl-doping in ZnO is inclined to occupy oxygen site.•Cl-doping is an effective method to eliminate oxygen vacancy.•ClO could form a donor level in ZnO:Cl.First-principles pseudopotential calculations have been performed to investigate the chorine-doped zinc oxide. From the calculated results, it is concluded that the ClO is energetically favorable and easy to form under the O-poor condition. Therefore, Cl-doping is an effective method to eliminate the oxygen vacancy in ZnO during the growth. However, the corresponding energy levels of ClO and Cli in band gap are rather deep so that they cannot play a role of donor or acceptor.

CuI thin film scintillator has potential applications in radiation detection systems due to its fast component of luminescence. Severe Fresnel reflection due to its large refractive index decreases its external quantum efficiency. In this article, we design an antireflection coating of SiO2 to efficiently eliminate Fresnel reflection and thus improve luminescence intensity. The optimal thickness of coating aimed at the maximum transmission for the omni-directional integration is obtained. The reduced Fresnel reflection by the antireflection coating is based upon the gradient-index and the interference effect. The luminescence intensity with an antireflection coating is increased by 20% at the emission peak wavelength.Highlights► An optimal antireflection coating increases the luminescence of CuI film scintillator. ► This coating is different from a quarter-wave-thick antireflective coating. ► It is based on gradient-index and interference principle aimed at omnidirection.