Sb^3+/Mn^2+ co-doped tunable white emitting borosilicate glasses for LEDs

Abstract

Luminescent properties of Sb(3+)/Mn(2+) co-doped borosilicate glasses containing no rare earth ions were systematically investigated through absorption, excitation, emission spectra, and decay curves. Upon 250-340 nm light excitation, the glasses exhibit broad blue emission at 400 nm (Sb(3+)) and red emission at 615 nm (Mn(2+)). The varied emitted color from blue through white and eventually to red can be obtained by properly tuning the content of Mn(2+) ions due to energy transfer from Sb(3+) to Mn(2+). Our investigation shows that Sb(3+)/Mn(2+) co-doped glasses may provide a new platform to design and fabricate luminescent materials for UV LED chips in the future.

Multi-wavelength-driven solar spectral conversion in P2O5–ZnO–Li2O glasses for improving greenhouse photosynthetic activity

“…Thereafter, the ligand field strength of the Mn 2 þ -Mn 2 þ is increased, which pushes the excited s state energetically closer to the lowest d ground state of Mn 2 þ . Finally, Mn 2 þ cations emit lower energy photons [8]. Besides, it is worthwhile to notice that the PL (λ ex ¼ 300 nm) spectrum of G-8SnMn4 consists of two parts: one blue band in 390-500 nm originating from Sn 2 þ and one red emission band peaking around at 620 nm in 550-750 nm owing to 4 T 1 -6 A 1 of Mn 2 þ .…”

“…The PLE spectrum monitored at 618 nm shows three wide excitation bands in 580-384, 384-340, and 340-200 nm, which covers the spectral region from UV to green light. The bands in 580-340 nm are attributed to the transitions from 6 A 1 ground state to the excited states of 4 E(G), 4 A 1 (G), 4 T 2 (G), 4 E (D), and 4 T 2 (D) of Mn 2 þ [8,18]. The latter is ascribed to the transition of T 1 -S 0 relaxation in Sn 2 þ -doped glasses [13].…”

“…3(c), the hues of the G-8SnMnz glasses as observable to the naked eye can be precisely tailored from blue to pink, and then to deep red via tuning the ET of Sn 2 þ -Mn 2 þ through simply adjusting the dopant content of Mn 2 þ upon 300 nm excitation. [8,18,19]. Upon the excitation of 354, 409, and 505 nm, Mn 2 þ cations are first excited from the 6 A 1 ground state to the excited states of 4 T 2 (D), 4 E(G), 4 A 1 (G), and 4 T 2 (G), respectively.…”

“…Unfortunately, most of the RE cations are expensive, toxic, and very unevenly distributed on earth, which seriously limits their applications in various fields [8]. Especially, trivalent RE cations with parityforbidden 4f-4f transitions and low oscillator strength have low emission efficiencies excited by UV-light [9][10][11][12].…”

Deep-UV-Driven Emission-Tailorable Borosilicate Glasses by Utilization of Sn2+Cations as Versatile Energy-Transfer Establishers

“…On the base of the above analyses, it is worthwhile to notice that borosilicate glasses are appropriate sealant materials to develop white-light emission devices. 3,6,8 To the best of our knowledge, there is no report on the emission properties of Sn 2+ -doped CaO-B 2 O 3 -SiO 2 borosilicate glasses and the interaction mechanisms between Sn 2+ and Tb 3+ /Mn 2+ have not been identified so far.In this work, the emission properties of ns 2 -type Sn 2+ doped CaO-B 2 O 3 -SiO 2 glasses were demonstrated. Multiple energy-transfer (ET) processes of Sn 2+ →Tb 3+ and Sn 2+ →Mn 2+ were systematically investigated.…”