Low-temperature photoluminescence in SnO2 high-resistivity monocrystals

Abstract

Stannic oxide monocrystals behave like photoluminescent emitters over the whole visible range. The emission spectra are measured for temperatures between 29 and 77 K. The shape and the width of emitted band components lead to an analyse of the data by the energy configuration–coordinate model. This quantum scheme is usually developed to describe the behaviour of colour centres in alkali‐halides or phosphors. Two emission bands are selected and analysed in this way, leading to the evaluation of characteristic parameters for two complexes, the physical origin of which is likely the same because of the common vibrational structure of their excited state. Energetic schemes are included in the band gap of SnO2 and related to the band‐to‐band excitation and to photoconductivity. The physical nature of these centres is emphasized.

Cathodoluminescence of defects in sintered tin oxide

“…A luminescence band at 2.58 eV could be present as a component in the broadband reported by some authors, e.g., in Ref. 4, but is not normally reported as a resolved band independent of the green and orange bands. In Ref.…”

Photoluminescence Properties of SnO2·H2O Phosphor

“…The electronic energies are determined in this study. [5][6][7][8][9][10][11] Most of these studies showed broad emission bands at ∼600−650 nm (Refs. 3), which is in fairly good agreement with that obtained from the transmittance measurement of bulk SnO 2 (∼3.5 eV at 300 K).…”

“…The fundamental absorption edge of SnO 2 · H 2 O is deduced from the diffuse reflectance spectrum to be ∼3.5 eV (Fig. [6][7][8]11 Some studies also showed in bulk SnO 2 very sharp free-and bound-exciton peaks near the band edge at T = 4−15 K (Ref. 3 Let us first discuss about the origin of the R and G emission bands in SnO 2 · H 2 O.…”

Tuning the Luminescence of Tin Oxide Low Dimensional Structures in the Near Infrared Range by In‐Situ Doping During a Vapor–Solid Growth Process

“…Some authors have attributed this NIR band to a high surface density of defects states, which is in agreement with the high surface/volume ratio that exhibit the microstructures describe in this work. The orange (1.98 eV) and the green emission (2.25 eV) are associated with oxygen vacancies and complex defects involving oxygen vacancies, while the blue emission (2.58 eV), is related to surface states …”

“…The orange (1.98 eV) and the green emission (2.25 eV) are associated with oxygen vacancies [21] and complex defects involving oxygen vacancies, [21] while the blue emission (2.58 eV), is related to surface states. [21,33] The incorporation of Li modifies the CL response by promoting the emission around 1.5 eV, as explained by del Prado et al [29] On the other hand, no sharp lines were observed in the SnO 2 :Li spectrum at about 1.70 eV (729.32 nm) corresponding to 2 S-2 P 0 intraionic transitions due to Li þ in other TCO's such as Ga 2 O 3 or TiO 2 as reported by some authors. [34,35] An allowed transition, 2 P 0 -2 S attributed to Li þ cations, [36] centered at 1.52 eV (815.8 nm) has also been reported.…”