Line Shift Method for Phosphor Temperature Measurements

Abstract

Two possible approaches to spectroscopic measurements of the internal temperature of Y2O2S: Eu are discussed. Methods based on relative Eu3+ fluorescence line intensities are found either to be insufficiently sensitive or to suffer from unavoidable experimental difficulties. The method which is adopted exploits the quadratic shift of the Eu3+5D0→7F0 transition energy with temperature. Controlled-temperature UV- and CR-excited fluorescence measurements establish the temperature calibration, which is then used to obtain the operating temperature of phosphor screens in a demountable CR excitation apparatus and in a tricolor CRT.

Interpretation of europium(III) spectra

“…The quadratic shift of the 5 D 0  7 F 0 transition energy of Eu 3+ with temperature has been used to determine the operating temperature of phosphor screens in cathode-ray tubes. The method is reliable than measurement of the relative intensities of the transitions in the luminescence spectrum [192]. [12,13,15,265,266].…”

Noncontact and instant detection of phosphor temperature in phosphor-converted white LEDs

“…In semi-invasive measurements, temperature-sensitive materials are introduced, which modify the component of interest and therefore disturb the temperature field. Finally, noninvasive measurements are a type of indirect spectroscopic approach 25–28 . This approach monitors either the intensity shifts or wavelength shifts of the fluorescence lines, which are highly sensitively to phosphor temperature.…”

Ho3+:TeO2 glass, a probe for temperature measurements

“…Thus Tripathi et al [7] have presented energy transfer based upconversion temperature sensor based on fluorescence intensity ratio technique. Kusama et al [8] for the first time discussed the fluorescence intensity ratio techniques for temperature monitoring using Y 2 O 2 S:Eu phosphor as the sensing medium within 100-300 K temperature range. The effect of temperature on the fluorescence from 5 D 1 and 5 D 0 levels using Eu 3+ doped optical fiber with 465 nm line as an excitation source have been investigated [9].…”