Synthesis of Chlorine-Silicate Phosphors for White Light-Emitting Diodes

Abstract

A novel approach to obtaining chlorine-silicate phosphors is developed. This method based on the synthesis in a microwave furnace is shown to provide the following advantages compared with the conventional procedures: (a) “warmer” color, (b) increased brightness, (c) significantly reduced processing time and cost. Phosphors are suitable for white LED and cathodoluminescent lamp applications.

One-Step Microwave Synthesis of New Hybrid Phosphor (CSSC) for White Light-Emitting Diodes

“…Typically, silicate phosphors are synthesized in a muffle furnace under a layer of coal [16] or in a hydrogen atmosphere [17]. Our previous works have demonstrated that microwave synthesis offers several advantages, such as reduced time, temperature, and energy costs during the synthesis process [18][19][20][21][22]. Additionally, the application of microwave energy to radio-absorbing materials, by means of the ponderomotive effect and electrodiffusion, enhances the characteristics of the phosphors [23][24][25][26][27][28].…”

Microwave synthesis of Eu-doped silicate phosphors

“…Recently new methods were applied to improve phosphor synthesis technology: utilization of plasma, shockwave treatment and microwave radiation [3][4][5][6]. Particularly in paper [6] it was demonstrated that synthesis of silicate phosphors in a microwave furnace provides a number of advantages compared with the conventional procedures (synthesis in muffle furnace in hydrogen atmosphere [7][8][9] and under the layer of coal [10,11]) including increased brightness as well as significantly reduced processing time and cost. Silicate and chlorine-silicate phosphors doped with Eu ions are of interest for white LED applications because of high chemical and thermal stability, durability and ability to form wide range of solid solutions.…”

Microwave synthesis of Eu-doped silicate phosphors

“…Thus, synthesis of phosphors for warm white light emitting diodes is an actual task nowadays. Recently new methods were applied to improve phosphor synthesis technology: utilization of plasma, shockwave treatment and microwave radiation [3][4][5][6]. Particularly in paper [6] it was demonstrated that synthesis of silicate phosphors in a microwave furnace provides a number of advantages compared with the conventional procedures (synthesis in muffle furnace in hydrogen atmosphere [7][8][9] and under the layer of coal [10,11]) including increased brightness as well as significantly reduced processing time and cost.…”

“…Recently new methods were applied to improve phosphor synthesis technology: utilization of plasma, shockwave treatment and microwave radiation [3][4][5][6]. Particularly in paper [6] it was demonstrated that synthesis of silicate phosphors in a microwave furnace provides a number of advantages compared with the conventional procedures (synthesis in muffle furnace in hydrogen atmosphere [7][8][9] and under the layer of coal [10,11]) including increased brightness as well as significantly reduced processing time and cost. Silicate and chlorine-silicate phosphors doped with Eu ions are of interest for white LED applications because of high chemical and thermal stability, durability and ability to form wide range of solid solutions.…”

“…Thus all samples were mixed phases and change of synthesis conditions allowed to control their phase composition and to adjust color properties of phosphors to achieve "warmer" or "colder" luminescence. All fabricated phosphors featured with high brightness and "warm" color of luminescence, which is another merit of the microwave synthesis in comparison with the conventional procedure [6]. Using synthesis setup "C" three layers of the phosphor were derived: top, middle and bottom.…”