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

Minzhen Wen, Baotong Guo, Shanghuan Chen, Xiao Hu, Xuejun Fan, Guoqi Zhang, Jiajie Fan

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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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.
Original languageEnglish
Title of host publicationProceedings of the 2023 24th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE)
PublisherIEEE
Pages1-7
Number of pages7
ISBN (Electronic)979-8-3503-4597-1
ISBN (Print)979-8-3503-4598-8
DOIs
Publication statusPublished - 2023
Event2023 24th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE) - Graz, Austria
Duration: 16 Apr 202319 Apr 2023
Conference number: 24th

Publication series

Name2023 24th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2023

Conference

Conference2023 24th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE)
Country/TerritoryAustria
CityGraz
Period16/04/2319/04/23

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Degradation
  • Resistance
  • Simulation
  • Phosphors
  • Humidity
  • Aging
  • Rendering (computer graphics)

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