A Study on Mechanical Characteristics of Phosphor Film Containing Methyl Silicone Resin Based on Crosslinking Reaction Analysis.

Jeong Park,Gil Yoon,Young Ko,Moonwoo La

doi:10.3390/polym10040370

Abstract

This study reveals a methodological research for predicting mechanical properties of phosphor films through the chemical crosslinking reaction of methyl silicone resin during fabrication of the phosphor films. Crosslinking point according to the type of methyl silicone resins was verified through the magnitude of the absorption peak of the functional group and the curing reaction heat. Then, we measured mechanical properties of the fabricated phosphor films. As a result, it was figured out that the number of the crosslinking point was directly proportional to the total curing reaction heat, and also affected the mechanical properties of the phosphor films. Based on the correlation of curing reaction heat and crosslinking point of the methyl silicone resins and mechanical properties of the fabricated phosphor films, we proposed a methodology that can understand and control the phosphor films in advance of finishing the fabrication of the final phosphor products.

Highlights

Phosphors are materials that absorb light emitted from a light source such as Light EmittingDiodes (LEDs) and convert it to light rays with different wavelengths
Capabilities to predict and adjust mechanical properties would be useful for technological development that could control the mechanical properties of phosphor films
The relationship of curing reaction heat of each phosphor slurry and the mechanical properties of phosphor films was analyzed, and an empirical equation that could predict the mechanical strength of phosphor films by measuring the heat of curing reaction heat was deduced

Summary

Introduction

Phosphors are materials that absorb light emitted from a light source such as Light EmittingDiodes (LEDs) and convert it to light rays with different wavelengths. Silicate phosphors have excellent chromaticity according to the operating current, and has the advantage that various wavelengths ranging from green and yellow to orange can be carried out by changing the chemical composition [1,2,3,4,5]. Phosphors are generally used in the form of a film, i.e., a phosphor film, combined with transparent materials such as PMMA (poly methyl methacrylate), epoxy resins, and glass. When phosphor particles are mixed in transparent resins, the ensuing product has enhanced mechanical strength such as hardness and tensile strength, while the tackiness reduces [6,7,8]. Particle reinforced resin shows strain amplification, which means average local strain exceeding macroscopic strain, because of the mixed particles dissipating the strain energy.

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Conclusion