Preparation of high-quality YAG:Ce3+ ceramic phosphor by high-frequency induction heated press sintering methods

Abstract

This study investigates the characteristics of a ceramic phosphor (CP) for the converter of a high-power laser diode-based automobile headlamp synthesized by high-frequency induction heated press (HFP) sintering. The CP prepared by an HFP method exhibits remarkable optical properties that are comparable to spark plasma sintering. The effects of post-treatment process for controlling residual pores, as well as sintering temperature, sintering pressure and heating rate for optimization of the HFP sintering method, were studied. The HFP sintering process can be widely used in ceramics and lighting fields because it is designed relatively low cost compared to other techniques and exhibits excellent productivity.

Optical grade (Gd 0.95- x Lu x Eu 0.05) 3Al 5O 12 ceramics with near-zero optical loss: Effects of Lu 3+ doping on structural feature, microstructure evolution, and far-red luminescence

“…The phosphor-converted light-emitting diodes (pc-LEDs) have advantages over conventional light sources in terms of high luminous efficiency, good durability, low power consumption, compact size, and friendliness to the environment, which make this illuminating system ideal for plant cultivation [9−13]. A ceramic phosphor is superior to the powder counterpart, since the bulk materials avoid using the organic polymer as the packaging materials which have poor thermal dispersion (thermal conductivity: 0.1−0.4 W•m −1 •K −1 ) to readily cause the degradation of luminous intensity, acceleration of aging, and changes in emission color upon long-term operation [14]. Besides, the difference in refractive indices between the powder phosphor and the organic resin would induce light scattering.…”