Zn 2+ (0, 2, 5, 7 and 10 at.%) co-doped CaMoO 4 :2Eu 3+ nanophosphors have been synthesized via polyol method using ethylene glycol (EG) as both capping agent and reaction medium at 150 o C.From XRD analysis, all 900 C annealed, Zn-co-doped CaMoO 4 :Eu 3+ have tetragonal scheelite phase.Some extra phase evolution has been observed for ASP Zn doped samples. Intensity and crystallinity of XRD patterns increase as heat treatment increases to 900 C. Valence state of the involved compositions (Zn co-doped CaMoO 4 : Eu) was investigated by X-ray photoelectron spectroscopy (XPS) and found that Ca, Mo, Eu and Zn are in their +2, +6, +3 and +2 oxidation states, respectively. TG-DSC studies of the as-prepared samples corroborate their thermal stability. TEM study reveals that particles have spherical morphology. Photoluminescence studies have been studied under ~266, and 395 nm excitation wavelengths. Zn co-doping in CaMoO 4 :Eu matrix, produces the high distortion and modify the crystal field around Eu 3+ ion and improves the PL intensity. CIE co-ordinates of 900 o C annealed 10 at.% Zn codoped CaMoO 4 :Eu sample under 266 nm excitation is x = 0.64 and y = 0.35, which are closer to the standard of NTSC (x = 0.67 and y = 0.33). CCT values vary for ASP and annealed samples at different excitation wavelengths. These investigations reveal that Zn co-doped CaMoO 4 :Eu 3+ nanophosphors can be used as potential red emitting phosphor which is bottleneck in the advancement of LEDs at much lower cost.performed to improve the luminescent properties of CaMoO 4 phosphor by co-doping of other metal ions. However, low efficacy of these nano-materials confined their generalised applications. Consequently, it will be of great interest to significantly enhance the emission intensity of phosphors in order to deploy their potential applications.The energy transfer mechanism from a sensitizer to an activator such as Eu 2+ /Mn 2+ , Ce 3+ /Mn 2+ , and Ce 3+/ Eu 2+ couples has been investigated in many inorganic hosts, and an effective resonancetype multi polar interaction has been verified in NaSr 4 (BO 3 ) 3 : Ce 3+ /, Mn 2+ , NaBa 4 (BO 3 ) 3 : Ce 3+ /Mn 2+ , Sr 3 Sc(PO 4 ) 3 : Eu 2+ / Mn 2+ ,Sr 3 B 2 O 6 : Ce 3+ , Eu 2+ ,and so on. Moreover, some single-phase phosphors, such as Ca 10 K(PO 4 ) 7 :Eu 2+ / Mn 2+ , Ca 9 Y(PO 4 ) 7 : Eu 2+ /Mn 2+ , Ca 9 Y(PO 4 ) 7 : Ce 3+ / Eu 2+ ,and Ca 9 Y(PO 4 ) 7 : Ce 3+ /Mn 2+ , are used to improve the emission intensity for n-UV LED (light emitting diode) applications. 11,13,14 Also an improvement in photo-luminescence intensity has been reported with co-doping of charge compensators such as Li + , K + , Na + and Bi 3+ in phosphors or with SiO 2 coating over particle of phosphor. In this direction, non-radiative rates are reduced by either charge compensation, improve crystallinity or extent of decrease of surface dangling bonds/OH bonds by shell from inner core phosphor. 15 Su and their co-workers also reported the enhanced photoluminescence in CaWO 4 based red phosphor via Eu and Na co-doping. 16 There ...