The Tuning Capability of CuO and Na2CO3 Dopant on Physical Properties for Laser Sealing Using Fiber Types of Sealant

So Young Kim,June Park,Jin Hyeok Kim,Linganna Kadathala,Seon Hoon Kim,Jong Hyeob Baek,Ju Hyeon Choi

doi:10.3390/app10010353

Abstract

PbO-SiO2-Al2O3-B2O3 (PSAB)-based glasses were prepared in order to determine the feasibility for laser sealing in the form of fiber. To reach a high quality of laser sealing, the tuning capability of CuO and Na2CO3 dopant concentration was examined on thermal, thermo-mechanical, and optical properties of glasses. The difference of thermal expansion coefficient was reduced with codoping of 1 wt% CuO-2 wt% Na2CO3 into the PSAB glass system, and it amounted to 0.34 × 10−6/K. The codoped PSAB glass system reached 100% absorption at 810 nm, which corresponds to the wavelength of laser. The glass fiber with a diameter of 180 μm was successfully pulled from the codoped PSAB glass system. The fluorine-doped tin oxide (FTO) glass substrate using the glass fiber was successfully sealed. It presented a crack-free sealed surface with a sealing strength of about 41 MPa. These results indicate that the PSAB-based glass system in the form of fiber is proved as a laser sealing material in packaging systems.

Highlights

State-of-the-art technology of industrial lasers has seen laser sealing techniques become an increasingly popular alternative for reliable packaging in many fields of manufacturing [1,2]
For the first time, to the best of our knowledge, we investigated the thermal, thermo-mechanical, and optical properties of the PbO-SiO2 -Al2 O3 -B2 O3 (PSAB) glass system doped with CuO and Na2 CO3 for laser sealing in the packaging systems
The results indicate that codoping into the PSAB system increased the coefficient of thermal expansion (CTE) and decreased the transmittance, i.e., increased the absorption at 810 nm

Summary

Introduction

State-of-the-art technology of industrial lasers has seen laser sealing techniques become an increasingly popular alternative for reliable packaging in many fields of manufacturing [1,2]. Laser sealing techniques have been intensively researched in packaging systems, such as dye sensitized solar cells, Organic Light-Emitting Diode These systems used the conventional furnace-based and laser-assisted glass frit sealing processes until now. Less pores, uniform height of sealing preform, 100% hermetic sealing, and low cost processing are essential for industrial applications [9] In this direction, laser sealing using glass fibers has been attractive owing to reducing the defective rate by improving the ability of sealant thickness. It controls the shape to prevent internal defects formation, such as pore and gas, during the process

Methods

Results

Conclusion