Logo exporting blurry/pixelated how to solve?

I am new to Illustrator and I have created a logo for my website. I am working with a developer who is setting it up in Word Press. When I see the logo on the site it looks blurry. The developer asked me to provide my original logo resized to 100px height. But when I do this the export is still blurry. My process is: Create an artboard that is 100x100px and resize my logo to fit inside it. Export as png, 72ppi. Anti Aliasing = None. I created the logo with a series of strokes + text. In order to resize the image, I outlined the path.