The book provides an overview of III-nitride-material-based light-emitting diode (LED) technology, from the basic material physics to the latest advances in the field, such as homoepitaxy and heteroepitaxy of the materials on different substrates. It also includes the latest advances in the field, such as approaches to improve quantum efficiency and reliability as well as novel structured LEDs. It explores the concept of material growth, chip structure, packaging, reliability and applicati...

This book studies healthy aging in China based on analyses of the datasets of eight waves of longitudinal survey in 1998-2018 with worldwide largest sample of oldest-old. It consists of four parts. The first part reports the 6th, 7th, and 8th surveys of “Chinese Longitudinal Healthy Longevity Survey” (CLHLS), with the largest sample of oldest-old aged 80+ in the world and comparable sample of young-old aged 65–79, trends and characteristics of physical health and mental health of older adu...