A roadmap for fabrication and characterization of nanophotonic scintillators

events hall

Ms. Neta Lahav

18.09.2022

David Wang Auditorium, 3rd floor Dalia Meidan Bldg.

14:30

Detection of high-energy photons is of great importance for applications in medical radiography and security inspections. Scintillation is the ability of particular organic and inorganic light emitting materials to absorb high-energy x-ray photons and convert them to lower-energy visible photons. Thus, scintillators are a vital component in standard x-ray detectors. “Nanophotonic scintillators” are a new conceptual design for scintillator materials. Light emission can be altered by integrating traditional scintillating materials within a periodic structure of different dielectric constants, to increase spontaneous emission rate and light yield. In this work, I have explored and demonstrated the first realization of this concept. The system of Eu-Bi doped Lu2O3 has been selected for its exceptionally high density and record of high light-yield. The process was optimized to increase layer refractive index and scintillation light yield. The scintillating layers were alternately deposited with low index SiO2 layers into a 16-layer structure. Sol-gel synthesis has been chosen as a cost-effective, versatile fabrication method for depositing homogeneously doped scintillator. Structural and morphological studies confirmed the formation of a cubic Lu2O3 phase and indicate dopant incorporation. Scintillation comparison between the photonic scintillator and a bulk reference layer, demonstrated light yield enhancement of 1.4 and faster decay rates by a factor of 1.65. Future projects would have to tackle process control and high-temperature compatibilities to meet its full potential.

BIO

BSc in material engineering and BSc in chemistry from Department of Materials Science and Engineering, Technion-Israel Institute of Technology. Worked for many years in the thin film-optics industry with world-wide experts.

Advisor: Asst. Prof. Yehonadav Bekenstein