Single-Crystalline ZnO/Graphene Quantum Dots Phosphors-Converted White Light-Emitting Diodes

Abstract

In this letter, phosphor-converted white lightemitting diodes (LEDs) were analyzed based on the singlecrystalline (SC) ZnO film/graphene quantum dots (GQDs) as phosphors with ultraviolet (UV) excitation. Color rendering index (CRI) and correlated color temperature (CCT) are found to be improved with injection current. The luminous efficiency of 245 lm/W at 260 mA has been achieved with 98 CRI and 5064 K CCT. The results show that the UV excited SC ZnO coated with GQDs white LEDs are more optically compatible for solid-state lighting, compared to the conventional blue chipexcited yellow phosphors LEDs.

Multifunctional Hierarchically Architectured ZnO for Luminescence, Photocatalytic, Electrocatalytic, and Energy Storage Applications

“…However, further effort is needed for real time application for this type of hierarchical structures. As compared to the previous report [24,25], the present results are quite encouraging to achieve the warm white light. needed for real time application for this type of hierarchical structures.…”

GaN phosphors converted white light‐emitting diodes for high luminous efficacy and improved thermal stability

“…Additionally, to resolve the energy crisis and to address the environmental concerns, rare-earth-free solid-state lighting is also in demand with different types of nanostructures [2][3][4][5][6][7]. YAG based and singlecrystalline phosphors might be able to fulfil the criteria, however, these alternatives have a limitation of low CRI and complex growth process, respectively [8,9]. The blending of different phosphors for UV-excited RGB LEDs also exhibits some critical problems.…”