Influence of modifier oxides on spectroscopic features of Nd2O3 doped PbO-Ro2O3–WO3–B2O3 glasses (with Ro2O3 = Sb2O3, Al2O3, and Bi2O3)

Effect of modifier oxides on spectroscopic and optical properties of Pr3+ doped PbO-Ro2O3–WO3–B2O3 glasses (with Ro2O = Sb2O3, Al2O3, and Bi2O3)

“…To better characterize the luminescent properties of the studied glasses, some other parameters have also been evaluated. For instance, to measure the experimental life time, the decay curves were fitted by using a double exponential equation as given below [6]:…”

“…where 𝐴 and 𝐴 are the fitting parameters, 𝐼 is the photoluminescence intensity at any given time 𝑡, and 𝑇 and 𝑇 are the slow and fast decay components, respectively. By considering the values of 𝑇 and 𝑇 , the average values of experimental life time 𝜏 are calculated by using the following expression for the emission states of Pr 3+ ions [6]:…”

“…Here, the decay rate can be calculated by both the radiative and the non-radiative contributions. On the other side, the quantum efficiency 𝜂 is considered as the radiative portion of the total relaxation rate, and can be computed as 𝜂 𝜏 /𝜏 [6], where 𝜏 is the experimental life time calculated from the decay curves following the above mentioned procedure, as shown in Fig. 11.…”

“…11. On the other hand, the non-radiative decay rate (𝑊 ) can be evaluated using the following equation [6]: The CIE color coordinates 𝑥, 𝑦 were calculated from the emission spectra for the studied Pr 3+ doped PbO-Ro2O3-WO3-B2O3 glasses (see results in Table 9). The emission spectrum has three parts: the first part is from green to yellow, the second part is from orange to red, and the third part becomes red (see Fig.…”

“…Among the glass formers, B2O3 has also become important due to its adequate physical, chemical, thermal, and mechanical stability, allowing to gain a high luminescence efficiency over a wide range of wavelengths. Furthermore, the addition of B2O3 into lead tungsten glasses is expected to increase the transparency, electrical resistivity, and chemical inertness of the host glass system in rare-earth ions [6].…”