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Tunable luminescence and efficient energy transfer investigation of a borosilicate phosphor KBSi 2 O 6 : Bi3+, Eu3+. [Display omitted] • Novel borosilicate phosphor KBSi 2 O 6 : Bi3+, Eu3+ are successfully synthesized. • Phase purity and tunable luminescence of KBSi 2 O 6 : Bi3+, Eu3+ are studied. • Effective energy transfer between Bi3+ and Eu3+ is demonstrated. • Hypersensitive thermal quenching is investigated with high S a and S r. Energy transfer between Bi3+ and Eu3+ has undergone substantial research but Bi3+ and Eu3+ co-doped luminescent materials with high energy transfer efficiency for temperature sensing are rarely investigated until now. Herein, Eu3+ and Bi3+ co-doped KBSi 2 O 6 phosphors were successfully synthesized by solid-state reaction method. The phase purity structure as well as the element distribution were carefully investigated through X-ray diffraction structural refinement and energy dispersive spectrometer analysis. The characteristic luminescence property and luminescence kinetics of KBSi 2 O 6 : Bi3+, Eu3+ were investigated. By the large spectra overlap between the emission spectrum of Bi3+ and excitation spectrum of Eu3+, the energy transfer from Bi3+ to Eu3+ can be inferred. The corresponding decrease of the emission intensity and decay time of Bi3+ in KBSi 2 O 6 : Bi3+, Eu3+ provided direct evidence for the effective energy transfer from Bi3+ to Eu3+. The interaction and energy transfer mechanism between Bi3+ and Eu3+ ions were also studied. By increasing the Eu3+ concentration in KBSi 2 O 6 : Bi3+, Eu3+, the color-tunable emission from blue to red can be realized. KBSi 2 O 6 : Bi3+, Eu3+ shows hypersensitive thermal quenching behavior and the maximum absolute sensitivity (S a) and relative sensitivity (S r) are determined to be 1.87 %K−1 and 2.895 %K−1, respectively. All of the above results imply that KBSi 2 O 6 : Bi3+, Eu3+ phosphor can be a color-tunable phosphor for optical temperature sensing. [ABSTRACT FROM AUTHOR]