To avoid thin white border around the text in illustrator

hey guys,

 

after saving artwork jpeg in illustrator adobe cs6. leaves thin white border around text(picture bellow).tried adding stroke same colour still have thin white border text. wouldn't problem except when background dark colour or black.
why this?? know how avoid frustrating problem?

 

shims,

 

what happens if save type/text png24 (and set matte black if makes difference)?

 

png24 more obvious choice jpeg vector artwork.

 

 

apart that, see no white.

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