Time-resolved photoluminescence of n-doped SrTiO_3

TL;DR

This study investigates the photoluminescence properties of n-doped SrTiO3 to understand its potential as a blue light emitter, analyzing recombination mechanisms and device bandwidth limits.

Contribution

It provides new insights into the electronic states and decay mechanisms in doped SrTiO3, relevant for optoelectronic device development.

Findings

Doping affects electronic transition states.

Recombination mechanisms are characterized.

Intrinsic bandwidth limit in GHz range.

Abstract

Following the recent surge of interest in n-doped strontium titanate as a possible blue light emitter, a time-resolved photoluminescence analysis was performed on nominally pure, Nb-doped and oxygen-deficient single-crystal SrTiO3 samples. The doping-effects on both the electronic states involved in the transition and the decay mechanism are respectively analyzed by comparing the spectral and dynamic features and the yields of the emission. Our time-resolved analysis, besides shedding some light on the basic recombination mechanisms acting in these materials, sets the intrinsic bandwidth limit of the proposed blue light emitting optoelectronic devices made of Ti-based perovskites heterostructures in the GHz range.