The Energy Transfer and Thermal Stability of a Blue‐Green Color Tunable K₂CaP₂O₇:Ce³⁺,Tb³⁺ Phosphor

Abstract

Novel blue‐green emitting Ce3+‐ and Tb3+‐activated K2CaP2O7 (KCPO) luminescent materials were synthesized via a solid‐state reaction method. X‐ray diffraction, luminescence spectroscopy, decay time, and fluorescent thermal stability tests have been used to characterize the prepared samples. The KCPO:Ce3+,Tb3+ luminescence spectra show broad band of Ce3+ ions and characteristic line of Tb3+ ion transition (5D4–7F5). The color variation in the light emitting from blue to green under UV excitation can be obtained by tailoring the Tb3+ content in KCPO:Ce3+. Besides, Ce3+ ions obviously intensify Tb3+ ion emission through an effective energy transfer process, which was confirmed from decay curves. The energy transfer efficiency was determined to be 82.51%. A resonant type mechanism via the dipole–quadrupole interaction can be proposed for energy transfer. As a whole, the KCPO:Ce3+,Tb3+ phosphor exhibits excellent performance in the range from 77 to 673 K, indicating the phosphors are highly potential candidates for solid‐state lighting.

Crystal structure, optical spectroscopy and energy transfer properties in NaZnPO4:Ce3+, Tb3+ phosphors for UV-based LEDs

“…† In this host, the Zn site with the 4e Wyckoff position which creates high stress in the lattice. There exist three kinds of Zn 2+ cation sites (Zn 10 , Zn 14 , and Zn 19 ) and three positions of Na + sites: Na (6), Na (7), and Na (18) with a coordination number (CN), CN ¼ 6 for Na (6) and Na (7) and CN ¼ 8 for Na (18). The interatomic distances of P-O, Zn-O, and the Na-O for the NZPO sample are listed in Table S3.…”

“…15 On the other hand, luminescence of Ce 3+ and Tb 3+ ions have gotten actual applications in lightings, detections, and displays. 10,16,17 Recently, various host materials for Ce/Tb system have been reported for lighting applications including Sr 2 LiScB 4 O 10 :Ce 3+ / Tb 3+ , 17 K 2 CaP 2 O 7 :Ce 3+ /Tb 3+ , 18 MgZn 2 (PO4) 2 :Ce 3+ /Tb 3+ (ref. 19) and SrMgSi 2 O 6 :Ce 3+ /Tb 3+ .…”

A broadband cyan-emitting Ca2LuZr2(AlO4)3:Ce3+ garnet phosphor for near-ultraviolet-pumped warm-white light-emitting diodes with an improved color rendering index

“…1,[34][35][36][37] In particular, Ce 3+ -doped garnet compounds can exhibit green, yellow, or even orange-red emissions because the dodecahedral sites where Ce 3+ ions are located show strong crystal-field strength. [38][39][40] Garnet-structure compounds with a general formula of L 3 D 2 (AO 4 ) 3 , where L, D, and A are dodecahedral site, octahedral site, and tetrahedral site, respectively, exhibit stable optical and chemical properties. [41][42][43] Therefore, garnet compounds are considered as good hosts for Ce 3+ ion doping; moreover, cyan emission in the 480-520 nm wavelength range might be expected in a suitable garnet-type compound doped with Ce 3+ ions.…”

Dy and Eu activated Ca3B2O6 phosphors for near ultraviolet‐based light‐emitting diodes

“…The selection of an appropriate host material is of importance, because it determines the local structure of luminescence activators. So far, the potential of various host materials for phosphors has been investigated, such as silicate, aluminate, phosphate, nitride, and borate . Among them, borate has drawn much attention since they merit in superior stability, low cost, and low synthesis temperature .…”

“…So far, the potential of various host materials for phosphors has been investigated, such as silicate, aluminate, phosphate, nitride, and borate. [8][9][10][11][12][13] Among them, borate has drawn much attention since they merit in superior stability, low cost, and low synthesis temperature. [14][15][16] In particular, Ca 3 B 2 O 6 phosphors doped with lanthanide ions were reported to exhibit good luminescence characteristics.…”