TY - JOUR
T1 - Upconversion emission in Er and Cr co-doped KNbO3 phosphors
AU - Kim, Tae Hong
AU - Kim, Dae Jin
AU - Jang, Woo Young
AU - Moon, Ayoung
AU - Lim, Ki Soo
AU - Lee, Myeongkyu
PY - 2011/6
Y1 - 2011/6
N2 - Near-infrared to visible upconversion emission was observed with 980 nm excitation and analyzed in Er-doped and Er/Cr-codoped KNbO3 phosphors. In both systems, exciton emission appeared at 555 nm under 405nm excitation. In the codoped phosphors, upconversion emissions in the green, red, and infrared region were observed from the 4S3/2 and 4F9/2 states of Er3+ ions and the 4T2 state of Cr3+ ions respectively. We explain the emissions by two-step absorption of Er ions and the energy transfer processes between Er ions, from Er to Cr ions, and from Cr to Er ions.
AB - Near-infrared to visible upconversion emission was observed with 980 nm excitation and analyzed in Er-doped and Er/Cr-codoped KNbO3 phosphors. In both systems, exciton emission appeared at 555 nm under 405nm excitation. In the codoped phosphors, upconversion emissions in the green, red, and infrared region were observed from the 4S3/2 and 4F9/2 states of Er3+ ions and the 4T2 state of Cr3+ ions respectively. We explain the emissions by two-step absorption of Er ions and the energy transfer processes between Er ions, from Er to Cr ions, and from Cr to Er ions.
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U2 - 10.1143/JJAP.50.06GH11
DO - 10.1143/JJAP.50.06GH11
M3 - Article
AN - SCOPUS:79959406218
SN - 0021-4922
VL - 50
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
IS - 6 PART 2
M1 - 06GH11
ER -