CURLFile not found

I try use CURLFile in yii2, I have php 5.5.12.

but yii return error fatal

PHP Fatal Error – yii\base\ErrorException

Class ‘frontend\models\CurlFile’ not found

my code

return new CurlFile(‘D:/photo_fb.jpg’,‘image/jpeg’);

how I can import curlfile in model class or controller

thank you for help me