HF-Free Preparation, High Thermal and Color Stability of Mn4+ Activated K2TiF6 Red Phosphors for White Light-Emitting Diodes

作者：Pan, Xixiang; Hou, Dejian^*; Zhou, Ming; Lai, Haizhen; Ming, Hong; Ye, Xinyu

来源：ECS Journal of Solid State Science and Technology, 2018, 7(1): R3006-R3011.

DOI：10.1149/2.0011801jss

• LED APPLICATIONS
• LUMINESCENCE PROPERTIES
• FORMATION MECHANISM
• PHOTOLUMINESCENCE
• TEMPERATURE
• IONS
• COPRECIPITATION
• SUBSTITUTION
• ENHANCEMENT
• OXYNITRIDE

Mn4+ activated fluoride phosphors have been considered as highly promising red component for warm white light-emitting diodes in recent years. In this paper, we successfully prepared the K2TiF6: Mn4+ red phosphors in H3PO4/KHF2 liquid instead of the hypertoxic HF liquid. The impact factors, such as the amount of F source, the reaction temperature, reaction time, and the luminescence mechanism are investigated in detail. We found that K2TiF6: Mn4+ shows pure red emission and can be excited by blue lights, which can perfectly match the InGaN chip based white light-emitting diodes. Most importantly, K2TiF6: Mn4+ exhibits excellent quenching behavior and shows small color shift in the temperature range of 300-475 K. Our researches could provide a green synthetic strategy to obtain the K2TiF6: Mn4+ phosphors and contribute to the optimization of red phosphors for white light-emitting diodes.

• 出版日期2018
• 单位江西理工大学