RESUMO
The surface plasmon resonance (SPR) of metal nanostructures is known to affect the optical properties of solid luminescent materials. Ag nanoparticles were first used to obtain a wider color gamut in rare-earth-doped phosphor-in-glass for application as color filters for white light emitting diodes. The existence of Ag nanocrystallites at nanometer scale and the independent integrity of the phosphor luminescence center in the amorphous glass environment were demonstrated. Using UV-Vis spectroscopy, the localized SPR absorption band was observed at 480 nm, and the optical properties of the nanostructures were found to be dependent on the annealing temperature. Hence, an expansion of the color gamut from 79.07% to 93.31% was realized by the coefficient effect of Nd3+ active ions and Ag nanoparticles. These results suggest that Nd3+-ion-co-doped phosphor-in-glass modified by Ag nanoparticles could be potentially applied as a novel optical material with a wide color gamut.
RESUMO
Phosphor-in-glass (PiG) is a novel fluorescent color conversion material that is an excellent choice for preparing wide-color gamut white LEDs due to its excellent thermal stability, high efficiency and facile preparation process. To the best of our knowledge, this paper is the first to widen the color gamut of the white LED from 77.33% to 92.02% by doping the PiG substrate with two kinds of lanthanide ions: Er3+ and Nd3+. The low sintering temperature and suitable preparation process has ensured the phosphor and glass become compounded independently together while still exhibiting good luminescence performance; this has been demonstrated via X-ray diffraction and field emission scanning electron microscopy. The influence of doping the host glass with Ln3+ ions has been explored, specifically considering the effects on the color gamut, the color coordination, the correlated color temperature and the color rendering index. The results presented herein have demonstrated that the Er3+/Nd3+-doped PiG is a promising candidate as a color filter in the domain of wide-color gamut white LED.
RESUMO
Recently, rare-earth-doped infrared (IR) luminescent glasses have drawn massive attention due to their potential applications in military, medical, and communications fields. In this Letter, we present a system of oxychloride Si-Ge-O-Cl glasses, suitable for rare-earth doping, which has been developed as a new, to the best of our knowledge, choice for IR luminescent materials. Raman spectra show a looser glass network because of the decreased phonon energy and density compared to the one in heavy-metal oxide glasses. The enhanced luminescence from the visible to the IR region has been obtained with a beneficial fluorescence decay time. The spectroscopy results indicate that the system of Si-Ge-O-Cl glasses may be a promising candidate for application in infrared laser materials with enhanced luminescence.
RESUMO
Lanthanide-doped optical functional glasses have received substantial attention in recent years owing to their excellent upconversion (UC) and infrared (IR) performance pumping when used in a semiconductor laser. In this study, the luminescence properties of Ho3+ ions were improved through the design of components used to modulate the microenvironment of the glass. To the best of our knowledge, this is a novel approach to enhancing the UC and IR emissions, and results in up to more than 130% improvement by regulating a tight network glass structure. Herein, the specific preparation design and investigations into the thermal, structural and luminescence properties are described, the results of which indicate that such ZnO-modified germanosilicate (SG-Zn) multicomponent glasses are promising candidates in the fields of biological security marking, optical communication, and 3D volumetric displays.
