Tricolor- and White Light–Emitting Ce³⁺/Tb³⁺/Mn²⁺-Coactivated Li₂Ca₄Si₄O₁₃ Phosphor via Energy Transfer

Abstract

Single-component tunable Li 2 Ca 4 Si 4 O 13 :Ce 3+ ,Tb 3+ ,Mn 2+ phosphors were successfully synthesized at 950 °C. Li 2 Ca 4 Si 4 O 13 :Ce 3+ ,Tb 3+ exhibits two luminescence peaking at 430 and 550 nm, which originated from the allowed 5d → 4f transition of the Ce 3+ ion and the 5 D 4 → 7 F J ( J = 6, 5, 4, 3) transition of the Tb 3+ ion, respectively. Moreover, by codoping Ce 3+ ions in the Li 2 Ca 4 Si 4 O 13 :Mn 2+ system, yellow-red emission from the forbidden transition of Mn 2+ could be enhanced. Under UV excitation, dual energy transfers (ETs), namely, Ce 3+ → Mn 2+ and Ce 3+ → Tb 3+ , are present in the Li 2 Ca 4 Si 4 O 13 :Ce 3+ ,Tb 3+ ,Mn 2+ system. The ET process was confirmed by the overlap of the excitation spectra, variations in the emission spectra, ET efficiency, and decay times of phosphors. In addition, quantum yields and CIE chromatic coordinates are presented. The emission color of these phosphors can be tuned precisely from blue to green via ET of Ce 3+ → Tb 3+ and from blue to yellow via ET of Ce 3+ → Mn 2+ . White light can also be achieved upon excitation of UV light by properly tuning the relative composition of Tb 3+ /Mn 2+ . This result indicates that the developed phosphor may be regarded as a good tunable emitting phosphor for UV light-emitting diodes.

Near ultraviolet light excitable highly efficient blue-green multicolour warwickite phosphor, ScCaO(BO3):Ce3+, Tb3+

“…Consequently, the FOM value is found to be the lowest value at 0.0898 in = 8 (dipole -quadrupole). Many kinds of Ce 3+ , 𝑠 Tb 3+ -co-doped phosphors exhibit the dipole -quadrupole interaction due to energy transfer between Ce 3+ with spin -allowed transition and Tb 3+ with spinforbidden transition [66][67][68][69][70] . Therefore, dipole -quadrupole interaction in SCBO:Ce 3+ , Tb 3+ is reasonable.…”

Optical analysis of Sr3Gd(PO4)3:Pr3+ phosphors for lighting applications

“…[1][2][3][4] The tri-colour phosphors play a significant part in the development of phosphor convertedwhite-light-emitting diodes (PC-WLEDs) by overcoming the limitations such as low colour-rendering-index and high-colourtemperature. [5][6][7] The orthophosphate phosphors of composition A 3 M (PO 4 ) 3 (where A = Ca, Ba, Sr and M = Y, Gd, La, Lu) show excellent advances for various scientific and technological applications. [8][9][10][11] The Sr 3 Gd(PO 4 ) 3 orthophosphate phase is of more interest due to its ease of fabrication at low temperatures, formation of single-crystalline phase and favourable luminescence behaviour.…”

Luminescence of the near‐ultraviolet blue‐emitting Ba9Al2Si6O24:Ce3+ phosphor

“…[ 1–8 ] Red, yellow, green, cyan, and blue phosphors have been developed for ultraviolet (UV) and/or blue chips to generate white LEDs. [ 9–17 ] Therefore, phosphors that can emit various colours play an important role in white LEDs.…”