Regarding screen resolution for PSD to HTML

Hi Guys,

I am having great time with IONIC I must say, I made my first app using default IONIC css, now I am working on my second and I am stuck with something.

I made PSD designs for my app,its ready. I am not sure which resoultion I should consider for that ?

Pixel resolution [ For iPhone 6 is -> 1134 * 750 ]
Device resolution displayed in browser [ For iphone 6 is 667*375 ]

Can anybody help me with this ?