一个功能较全面的树，可自由加减树的节点，展示树的各级节点-A function of a more comprehensive tree, free tree node addition and subtraction to demonstrate at all levels of the tree node

Optical properties of chlorophosphate glasses of the type 50P2O5–30Na2HPO4–20RCl (R = potassium and lead) activated by 0×1 and 0×5 mol of Pr3+ and Nd3+ have been investigated. Optical band gaps (Eopt) have been reported for 0×1 and 0×5 mol concen