“…5,6 The current WLED is formed by combining the InGaN-based blue LED chip with the yellow luminous YAG:Ce 3+ phosphor. 7,8 An alternative method is to use a NUV LED chip to stimulate RGB (red, blue, green) phosphors to obtain white light, which is the most popular type in the market. However, there are still some problems in the realization of white light through polyphase phosphors, such as proportion control, color absorption, color subtraction and so on.…”