Hydrolysis Mechanism Analysis of (Ca, Sr)AlSiN₃:Eu²⁺ Red Phosphor Aged Under Pressure Cooker Test and 85°C&85%RH Test: Kinetics Modeling and First-principles Calculation

Conference paper (2023)

Authors

Minzhen Wen Fudan University
Baotong Guo Fudan University
Shanghuan Chen Hohai University
X. Hu Electronic Components, Technology and Materials - EEMCS
Xuejun Fan Lamar University
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
J. Fan Electronic Components, Technology and Materials - EEMCS , Chinese Academy of Sciences, Fudan Zhangjiang Institute,, Fudan University
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
Copyright: © 2023 Minzhen Wen, Baotong Guo, Shanghuan Chen, X. Hu, Xuejun Fan, Kouchi Zhang, J. Fan
DOI
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https://doi.org/10.1109/EuroSimE56861.2023.10100750
Simulation Degradation Aging Resistance Phosphors Humidity Rendering (computer graphics)
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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

The (Ca, Sr) AlSiN₃:Eu²⁺(CSASN:Eu) red phosphor is widely used to improve color rendering of high-power phosphor-converted lighting diode (pc-WLED), but it is always unstable under high temperature and high humidity environments. Therefore, the studies on the temperature and humidity resistance of red phosphors and their aging mechanism have become essential to evaluate its reliability in harsh applications. In this paper, the pressure cooker test (PCT) and 85°C&85% RH aging test were carried out for the CSASN:Eu red phosphors. And, its hydrolysis reaction-driven degradation mechanism was simulated and analyzed based on first-principle calculation, in which the optimized adsorption of simplified CaAlSiN3(CASN) and H2 O was simulated based on Density Function Theory (DFT) and the specific aging process was analyzed by the charge density difference and ab initio molecular dynamics (AIMD). The experimental results showed that the photoluminescence performance of CSASN:Eu red phosphor dropped gradually and finally disappeared under PCT aging, and its temperature-dependent degradation kinetics followed the Arrhenius model well. Meanwhile, the simulation results indicate that the CASN, reacted with H2 O when the H atoms had a tendency to approach N atoms. Both the temperature and humidity could accelerate the hydrolysis reaction rate.