References: 1)Hassan Hafeez, Zhanan Zou, Dong Hyun Kim, Jun Young Shin, Myungkwan Song, Chang Su Kim, Won Jin Choi, Jizhou Song, Jianliang Xiao and Seung Yoon Ryu*,"Multiaxial Wavy Top-Emission Organic Light-Emitting Diodes on Thermally Prestrained Elastomeric Substrates", Organic Electronics, 48 (2017) 314–322.