As a general rule, only other iDevices can see emojis created from the iPad. You could, however, look up and keep handy some Unicode symbols for typing. I installed an app that puts a whole bunch of Unicode characters in my Contacts app. I'm not sure I like where they are, but I do like the fact that I can put in a smiley face that can be read by everyone I sent the text or e-mail to ... so far.
It'd be nice if all devices could talk as well to each other and we can use the fancy emojis (because there are way more than Unicode ever thought of), but, in a pinch and with no other options, I use Unicode.
Marilyn