Rare-Earth Activated Nitride Phosphors: Synthesis, Luminescence and Applications

Abstract

Nitridosilicates are structurally built up on three-dimensional SiN4 tetrahedral networks, forming a very interesting class of materials with high thermomechanical properties, hardness, and wide band gap. Traditionally, nitridosilicates are often used as structural materials such as abrasive particles, cutting tools, turbine blade, etc. Recently, the luminescence of rare earth doped nitridosilicates has been extensively studied, and a novel family of luminescent materials has been developed. This paper reviews the synthesis, luminescence and applications of nitridosilicate phosphors, with emphasis on rare earth nitrides in the system of M-Si-Al-O-N (M = Li, Ca, Sr, Ba, La) and their applications in white LEDs. These phosphors exhibit interesting luminescent properties, such as red-shifted excitation and emission, small Stokes shift, small thermal quenching, and high conversion efficiency, enabling them to use as down-conversion luminescent materials in white LEDs with tunable color temperature and high color rendering index.

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

“…[1][2][3][4] To date, β-SiAlON:Eu, as the state-of-the-art green phosphor, is widely applied to fabricate advanced wide-gamut backlighting device due to its favourable properties, such as narrow emission bandwidth (45-55 nm), excellent thermal quenching behavior (~10% emission loss at 150 °C), and high external quantum efficiency. However, the origin of narrow-band-emission in β-SiAlON:Eu and the underlying reason for tunable photoluminescence through replacing Si-N by Al-O remains under debate.…”

Novel green-emitting Ho³⁺-doped scandate phosphors

“…This is attributed to the rapid cooling that occurs in the melt synthesis using an arc imaging furnace. Figure 4 shows the excitation and emission spectra of Ba 3 -(Sc 0.94 Ho 0.06 ) 4 24) The emission peak intensities of the sample synthesized by the melt synthesis method are 1.79 times greater than those of the sample synthesized by the solidstate reaction. The reason for this improvement is attributed to the high dispersion of Ho 3+ in the sample prepared by melt synthesis.…”

“…To investigate the dispersion of Ho 3+ ions in both Ba 3 (Sc 0.94 -Ho 0.06 ) 4 O 9 samples, X-ray mapping images of Ba, Sc, and Ho were measured by EPMA. The results are shown in Fig.…”

New Narrow-Band Luminescence Using Lanthanide Coordination Compounds for Light-Emitting Diodes

“…Solid state lighting based on white light emitting diodes (LED) are well known for display devices and the inorganic phosphors have a great attention for their useful advantages in the devices [1]. Inorganic phosphors are exact materials for blue-chip excitation with intensive luminescence and high reliability.…”