Eu3+ photoluminescence enhancement due to thermal energy transfer in Eu2O3-doped SiO2–B2O3–PbO2 glasses system

Abstract

a b s t r a c tIn this work, Eu 3 + -doped lead borosilicate glasses (SiO 2 -B 2 O 3 -PbO 2 ) synthesized by fusion method had their optical properties investigated as a function of temperature. Atomic Force Microscopy images obtained for a glass matrix annealed at 350 and 500 1C show a precipitated crystalline phase with sizes 11 and 21 nm, respectively. Besides, as the temperature increases from 350 to 300 K a strong Eu 3 + photoluminescence (PL) enhancement takes place. This anomalous feature is attributed to the thermally activated carrier transfer process from nanocrystals and charged intrinsic defects states to Eu 3 + energy levels. In addition, the PL peaks in this temperature range were assigned to the Eu 3 + transitions 5 D 0 -7 F 2 , at 612 nm, 5 D 0 -7 F 1 , at 595 nm, and 5 D 0 -7 F 0 , at 585 nm. It was also observed that the 5 D 0 -7 F 3 and 5 D 0 -7 F 4 PL bands at 655 and 700 nm, respectively, show a continuous decrease in intensity as the temperature increases.

A study of structural, optical and dielectric properties of Eu2O3 doped borate glass

“…The orange and red light emissions were associated with transitions of 5 D 0  5 F 1 and 5 D 0  5 F 2 respectively. The present work suggests that the excitation spectra arises from the transition of 5 D 2  5 F 0 and also agrees with the studies done by Lourenc-o et al (2011). It confirms the feasibility of using this glass for UV green LED excitation.…”

Influence of crystal field potential on the spectroscopic parameters of SiO2·B2O3·PbO glass doped with Nd2O3

“…The nanoparticle Raman spectrum is assigned to that of cristobalite, which is usually observed in the crystallization processes of borosilicate glass [25,26]. The Raman peaks in Fig.…”

Electroluminescence of Light- Emitting Organic Semiconductor/ Europium Oxide Nanoparticle Hybrid Junction

“…61, No. 8, pp: 1952-1959 3591 The violet radiation at ≈360 nm is caused by the band to band transition [2]. The transition from the blue emission of 430 nm to blue emission of 513 nm corresponds to the transitions of 5 D 3 and 5 D 2 to 7 F 0 , 7 F 2 and 7 F 3 .…”

“…Excitations through nan-radiative vitality move from the TPD to the Eu2O3 NPs because the EL device structures with a sub-10nm separation between TPD and Eu2O3 NPs [15]. The green emission 513-585nm corresponds to 5 D 0 , 5 D 1 and 5 D 2 to 7 F 0 , 7 F 1-2 and 7 F 3 transitions [2,12]. The orange 595nm to red emission around 700 nm is related to 5 D 0 to 7 F 0 , 7 F 1-2 and 7 F 3-4 transitions or to the nan-radiative vitality of the surface state in nanostructure to V.B of Eu 2 O 3 [3].…”

“…The deep sub levels ( 5 D 0 → 7 F 0, 1, 2, 3 and 4 ) in Eu 2 O 3 are resulting from the splitting of spectrum lines, which is known as the effect of stark on the atom. It can also partially occur because of the presence under the influence of an external electric field, which can be responsible for the emission of a band with different colors that include the whole visible spectrum [2,3]. Due to this property, Eu 2 O 3 is used in white LEDs [4].…”