Blue to magenta tunable luminescence from LaGaO₃: Bi³⁺, Cr³⁺ doped phosphors for field emission display applications

Abstract

A series of blue to magenta emitting color-tunable LaGaO3: Bi3+/Cr3+ phosphors were prepared by chemical route, and their phase structure, morphology and photoluminescence (PL) properties were investigated.

Different Strategies of Stabilization of Vanadium Oxidation States in Lagao3 Nanocrystals

“…These results confirm that the sol-gel citric acid-assisted synthesis with and without charge compensation allows to obtain the LaGaO 3 :V nanocrystals of high structural purity. The analyzed structure consists of 6-fold coordinated Ga 3+ (GaO 6 ) 9− and 8-fold coordinated La 3+ ions, where La 3+ sites are situated between slightly tilted and distorted (GaO 6 ) 9− layers (Marti et al, 1994; Ryba-Romanowski et al, 1999a,b; Kamal et al, 2017; Kniec and Marciniak, 2018a) (Figure 1b). As it was mentioned in the previous work (Kniec and Marciniak, 2018a), due the similarities in valence states and ionic radii between Ga 3+ and V ions (0.76, 0.78, 0.72, and 0.54 Å Kniec and Marciniak, 2018a, for Ga 3+ , V 3+ , V 4+ , and V 5+ , respectively) V occupy octahedral site of Ga 3+ ions in the LaGaO 3 matrix.…”

Pair‐Emission‐Induced Near‐Infrared Lasing from Ceramic Ga:LaCrO3 Microcrystals at Room Temperature

“…[ 31,32 ] From the values of the coefficient A 1 and A 2 , it can be seen that the contribution of pair ion emission is 99.2%, which is a piece of clear evidence for the dominance of pair emission in the system. In previous reports (with less Cr concentration), the lifetime of this kind of systems falls in the microseconds to milliseconds [ 33 ] range. But remarkably in our system, it is of the order of the sub‐nanosecond range.…”

Broadband Cr3+, Sn4+‐Doped Oxide Nanophosphors for Infrared Mini Light‐Emitting Diodes

“…Inorganic light‐emitting diodes (LEDs) show the highest potential among display technologies, showing better performance in terms of lifespan, energy efficiency, safety, and color rendering index . As lighting and displays gain increasing importance in life, liquid‐crystal displays (LCDs), organic LEDs (OLEDs), and quantum dot LEDs (QLEDs) have recently been developed .…”

“…As lighting and displays gain increasing importance in life, liquid‐crystal displays (LCDs), organic LEDs (OLEDs), and quantum dot LEDs (QLEDs) have recently been developed . The plastic and organic layers of OLEDs are thinner, lighter, and more flexible than the crystalline layers of LEDs or LCDs . To improve brightness and produce deeper colors, a major luminous material can be used to replace the organic layer with quantum dot layer, which has good wavelength tunability .…”