Spectral response tuning of organic photodetectors using strong microcavity effects for medical X-ray detector application

Kunsik An, Chaewon Kim, Kwan Hyun Cho, Seunghwan Bae, Bo Kyung Cha, Kyung-Tae Kang,

Organic Electronics, Volume 100, 2022, 106384

doi.org/10.1016/j.orgel.2021.106384

An X-ray detector system was fabricated with an organic small molecule photodetector and a terbium-doped gadolinium oxysulfide (Gd2O2S:Tb) scintillating screen. Though the microsphere cluster structure of the Gd2O2S film had advantage in low material cost, wavelength matching to the proper photodetector is challenging due to its scintillating performance property in the relatively narrow emission spectrum range.

This work, including the spectral tuning using the strong microcavity effect and X-ray detection for medical applications, will provide new insights for the further development of OPDs.

The optical calculation of the absorption spectra was carried out using SETFOS. The optical constants n (refractive index) and k (absorption index) were obtained from the software.