Carbon dot(CD)-doped sodium borosilicate gel(CD-NBS gel)glasses were successfully prepared by incorporating the CDs into sodium borosilicate networks.The structural and luminescent properties of highly flexible CD-NBS gel glasses with 5%wt.%to 70 wt.%CDs were studied.Images of the CD-NBS gel glasses captured through a transmission electron microscope demonstrated the uniformity and good dispersibility of the glasses.Red-shifted emission and enhanced quantum efficiency were observed when the doping concentration of CD in the NBS gel glasses increased.The enhanced fluorescent properties of the CD-NBS gel glasses were considered to originate from the surface modification of CDs with high dopant concentration in the gel glasses.CD-based white light-emitting diodes(W-LEDs)were developed by combining the yellow-emitting CD-NBS gel glasses with blue GaN-based LED chips.The as-fabricated W-LEDs exhibited the optimised colour coordinate of(0.32,0.33),the colour rendering index up to 78.9,and the maximum luminous efficacy exceeding 58.1 lm/W by the use of the CD-NBS gel glasses with different concentrations of CDs.These results indicate that the new kind of CD-NBS gel glasses would be a promising candidate for W-LEDs.