$scope.SaveDB(iObj,function(iResult){
//after a sucessfull opreation in the DB. Now  I need iObj to pass to other controller.
// I have used $emit method
$rootScope.$emit('saveCallback');
})

var _save = $rootScope.$on('saveCallback',function(){
//i want same obj(which is used for saving ) to be access here.
})

$scope.SaveDB(iObj,function(iResult){
  $scope.$emit('saveCallback',iResult); //pass the data as the second parameter
});

$scope.$on('saveCallback',function(event,iResult){//receive the data as second parameter

});

$scope.SaveDB(iObj,function(iResult){

   $scope.$emit('saveCallback',iResult);
});

$scope.$on('saveCallback',function (event,iresult){
    $scope.$broadcast('saveCallback',iresult);
});

$scope.SaveDB(iObj,function(iResult){
   $rootScope.$broadcast('saveCallback',iResult);
});

$scope.$on('saveCallBack',function(event, data) {
   //access data here
});

$rootScope.$broadcast('saveCallback',iresult);

$scope.$on('saveCallBack',function(event, data) {
   //access data here
});