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A study of the variables affecting adhesion strength of electrophoretically deposited phosphors
Author(s) -
Russ Benjamin E.,
Talbot Jan B.,
Sluzky Esther
Publication year - 1996
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1985018
Subject(s) - phosphor , materials science , adhesion , coating , substrate (aquarium) , deposition (geology) , composite material , electrophoretic deposition , adhesive , layer (electronics) , paint adhesion testing , chemical engineering , optoelectronics , paleontology , oceanography , sediment , engineering , biology , geology
— Electrophoretic deposition of phosphor particles onto substrates is used in the manufacturing of screens for advanced display applications. The effects of deposition conditions on the adhesive properties of electrophoretically deposited phosphor coatings were investigated. The adhesion was measured with a gas‐jet tester which utilizes a short pulse of nitrogen gas to remove phosphor particles from the substrate. The percentage of phosphor particles remaining on the substrate after the test was used as a qualitative measure of adhesion strength, whereas the average diameter of the “ring” of particles removed was correlated to a quantitative measure of the adhesion strength. It was found that the adhesion strength was independent of applied voltage, conductive coating on the substrate, deposit thickness, phosphor concentration, and post‐deposition treatment with water and MgO top coating. The adhesion strength was enhanced by post‐deposition baking (at 425°C) and increasing the water content of the deposition bath. The adhesion strength is also dependent upon the type of phosphor deposited and exposure of the deposits to humidity.