Status and Challenges of Blue OLEDs: A Review oleh Iram Siddiqui, Sudhir Kumar, Yi-Fang Tsai, Prakalp Gautam, Shahnawaz, Kiran Kesavan, Jin-Ting Lin, Luke Khai, Kuo-Hsien Chou, Abhijeet Choudhury, Saulius Grigalevicius, Jwo-Huei Jou