1. State Key Lab of
New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
2. School of Materials Science & Engineering, Shandong University, Jinan 250061, Shandong, P. R. China
3. Shenzhen Jiawei Solar Lighting Co., Ltd., New Industrial Zone No. 1-4, Fuping Road, Longgang District, Shenzhen 518112, Guangdong, P. R. China