Na₂TiGeO₅—A self‐light‐emitting phosphor with the stable structure and tunable emission resulted from Cr³⁺‐doped for FEDs

Abstract

For matching the high energy excitation by the low voltage electron beams, the phosphors with stable crystal structure and high energy level excitation band is necessary. In this work, it is interesting to find a suitable phosphor of Na 2 TiGeO 5 with self-light emitting property. The tight crystal structure of Na 2 TiGeO 5 formed by edge-shared NaO 6 and TO 5 polyhedrons corresponds to its good thermal stability and degradation resistance property. The results indicate that the PL and CL intensity can still remain beyond 80% and 90% at 150°C and after 1 hour electron beams bombardment, respectively. Under the 254 nm excitation, the bright blue light peaked at 460 nm can be detected and the light control has been realized with the Cr 3+ doped, which changes blue light to cyan light. The high energy excitation is attributed to the charge transfer band (CTB) of Ti 4+ -O 2− , which matches the electron beams. The bright CL emission light centered at 450 nm with good degradation resistance property has been detected. The results indicate its potential application in field emission display (FED)s. K E Y W O R D Scathodoluminescence, field emission display, Na 2 TiGeO 5 , photoluminescence, self-light emitting

Review—Temperature Dependence of Luminescence Intensity and Decay Time in Cr3+-Activated Oxide and Fluoride Phosphors

“…Concerning group F-Cr phosphors, the following articles are reported to have the relatively high PL quenching temperature of T 1/2 > 450 K: K 2 NaGaF 6 :Cr 3+ (Ref. 54) Population/depopulation effects at the 2 E g and 4 T 2g excited states on PL spectral feature.-Let us finally discuss the effects of temperature-induced population/depopulation between the 2 E g and 4 T 2g excited states on the PL spectral feature of the Cr 3+ -activated oxide phosphors. The parabolic bands in Fig.…”